If this isn't news feel free to delete it Mods.

Anyway googling some info for a possible 4th movie and came across this which was posted 4 hours ago:

Producer Don Revealed There Will Be A ‘Transformers 4′ Flick & More | Hollywood Hills

I remember he tweeted about the possibility but this seems to be more of a confirmation.

 

sounds like the same shpiel that was posted awhile back

still, i wouldnt doubt there's a 4th one being planned. these movies just make too much money for them to stop now

 

This was mentioned a while back IIRC, the whole second trilogy thing. I definitely remember seeing some discussion before now.

 

Yes, here we go:

Don Murphy Comments on the Future of the Movie Franchise - Transformers News - TFW2005

Of course, then we had this two days later:

Michael Bay Squashes Statham Rumor - Transformers News - TFW2005


While referring to another rumor at the time, the fact he categorically states no plans for 4 then implies the earlier report is exaggerated. I've no doubt 4 will happen, but there's no confirmation here yet.