I really think WB will go for a Superbowl spot this year for BvS. It just makes too much sense, release will be 6 weeks away, biggest movie WB has released for almost 3+ years now, and 6 weeks before release is about the right time to start the final marketing push, especially with not many big movies being released at that time.
There is literally one movie which looks like a potential 100M+ performer between the Deadpool/Zoolander 2 weekend and BvS weekend which is Zootopia 3 weeks before BvS. If marketing can really go in top gear like it did for TDKR and MoS, and if reviews complement the final marketing push, this can open huge over Easter for sure. I am hoping it does really well.