Fusible.com is reporting that the WHOIS records for MarkMonitor presents three possible titles for Transformers 4. MarkMonitor is a brand protection company that Paramount Pictures used to get the TransformersDarkoftheMoon.com domain and claimed three .com domains for possible TF4 titles. The titles:

Transformers: Apocalypse (WHOIS)
Transformers: Last Stand (WHOIS)
Transformers: Future Cast (WHOIS)

Keep in mind these are just possibilities and odds ones to me, mostly because they invoke other movies. Apocalypse was the sub-title of the second Resident Evil movie while Last Stand was the sub-title of the third X-Men movie. As for "Future Cast", it sounds a little to close to the subtitle of X-Men: Days of Future Past, the next X-movie coming out in 2014. I am more inclined to think that these are actually domain buys for Hasbro for their next cartoon series or video game. As always time will tell.