Guess I'll take this one on...
Spikey, first welcome...
Ok, I think it's safe to say you're putting the cart before the horse, or the fall before the cog, if you will...
So yes, in the "Rise Of Electro trailer at 2:34 we can see Gwen Stacy standing and looking up in the same building/clock tower, as if Spidey is battling the Weird Goblin all the way up."
Actually the indication is that this is after her initial fall through the domed roof. She is likely standing on the cog that we see her on. In fact, in the background of this pic you can see a cog.
Next you indicated "Besides, there is a picture of her sitting/kneeling on top of a gear..."
Obviously this pic is before Gwen's fall. We actually have a new pic with Spidey and Gobbie battling on that same cog, which means Gwen would have had to vacate it prior.
You then stated "So, she survives that fall. I'm not saying that she won't die, I'm just saying that the fall will not cause her demise."
But these pics that you're using, we believe, are from before the fall.
Here, I'm going to help you see the scene as we believe it will happen:
Ok, first we know that it will start (as we've seen in the Superbowl Trailer) with Gwen falling, Spidey jumping up to catch her, and them crashing through the glass, domed roof:
So here's the pic of Spidey jumping up, and we've been shown that they then crash through.
A good assuption is that Gwen and Spidey get separated with Gwen landing on the cog, as shown below:
In fact, this pic looks like she is starting to get to her feet. Likely up above Gobbie comes flying in to attack, as shown in the trailer.
They will battle, which is when we will likely see Gwen looking up, as shown below:
You can see the cogs and the lights in the above pic, showing that it is from within the clock tower.
They will battle, as shown below:
Now, something will happen to Gwen, causing her to fall off of her cog. Likely this will be Gobbie related.
We know for a fact a second after we see Gwen fall we then see Spidey jump down (to a different cog than the one Gwen was on) and cast his web, as shown below:
What a gorgous shot, by the way, with the moon behind... Anyway, in the trailer we then see Gwen hanging, conscious, and definitely alive.
It seems obvious that while Peter is distracted while trying to save Gwen Gobbie will attack. I've surmised that Gobbie and Spidey will end up toppling over and will land on the same cog that Gwen was just previously on, as shown in the pic below:
Now, lots of questions at this point. Did Peter just lose hold of the web that Gwen was grasping, or did Gobbie cut it? If you look at Gobbie's left hand you will see some sort of hilt looking thing, that could be indicative of a knife. It has been surmised by some that maybe that is some apparatus that will steal Peter's blood, but we'll see.
Anyway, I expact that this above shot, of Peter and Gobbie fighting on the same cog that Gwen was just on, will be mere seconds. Likely Gwen is now falling and you can see that Spidey has his foot up ready to kick Gobbie off. My guess is that he will do just that and then dive off of the cog after Gwen, while Gobbie uses that moment to escape.
This leads to this shot:
Which is when Spiderman is diving to try to save Gwen. You can see that she is too far away for him to catch up, from the reflection. He's likly not going to be able to use the kick off, catch up, and swing down technique (been there, done that). This means that either she will go splat (that won't look good on camera) or he'll do what we've all been waiting for. He'll have to throw out a webb, cast another upward, or grab ahold of something, to try to stop their momentum. This would result in the "snik" we've been expecting.
Look, we know that Webb and Emma want to do this right, and even though it's not from the bridge (been there, done that) and it's not Norman (again, been there, done that), we're still getting the Night Gwen Stacy Died. Also, in the above pic, you can see that Peter is seeing Gwen, as shown in the below pic. Just look at the way her jacket is blowing.
So, he'll throw out a web and as you can see in this above pic, the spot he would catch is her feet (since they are higher than the rest of her body), just like in The Night Gwen Stacy Died.
He'll likely lower himself down to her and realize that he did not save her as he thought. Of course this would lead to emotion that would only come from the death of someone this close to him, as shown in the pic below:
Can't see this level of emotion coming from the loss of anyone other than Gwen. Maybe Aunt May, but I haven't seen any pics of her hanging out at the clock tower. So, this is gwen. Also, look at the background of this picture and you can see that it is at the clock tower. Same lights, etc.
So, there you go. Hopefully you now understand the way this will likely go down.
Of course, subject to change when we get some new shots next week...