I think that most people are refering to this.
Quote from Matt Sprange, posted on the Planet Mongoose blog, 24/08/07
"So, where are the good things for Battlefield Evo, I hear you ask? Some extremely interesting things there, I can tell you. I mentioned in Signs & Portents that a rather large company had tapped us on the shoulder about the game. Well, we have had the initial meeting, and it seems we see eye-to-eye on many levels, and a second meeting is scheduled to take place in a couple of weeks. What can we tell you about all this? Absolutely nothing!
Not kidding, we have been NDA'd up to the eyeballs on this one. I will say this though. If you are concerned right now about the future of Battlefield Evo (and its cousin, SST Evo), don't panic. Bide your time like any true military commander, and wait for the cover of night (so to speak). What is coming is not too far down the road in the grand scheme of things and it will blow your socks off. I promise you, you will think 'yes, that is the perfect fit - and it was well worth the wait.' We are pretty stoked about this ourselves, so keep an eye on Planet Mongoose, and we will let you know what we can, when we can."
What does it all mean? No idea, but at least Mongoose has started to release minis for the SST again (in both formats, original and Evo).