Sabretooth: I believe it's time for the fans, as well as the general audiences who go to see the X-Men films to finally get a true taste of the rivalry between Wolverine and Sabretooth that has been around for years in the comics, and what better film should this take place in than Wolverines very own spin off film? The Sabretooth seen in Singer's first effort was a great injustice to that particular character, and it certainly wouldnt be a bad idea to see him not only reinterpreted to make him a bit more in line with the comic book version, but also more fleshed out since we honestly didnt get an idea of what this guy was truly all about.
Blob: Well, we kinda got him in X-Men 3 with the Phat character, but I wouldnt mind seeing him appear if it's deemed necessary to the plot. Nor would I be opposed to a simple cameo either. However, if it's ultimately decided that The Blob is best left in pre-production as he was with the original X-Men film, I certainly wouldnt be heartbroken about it.