Is that a CLU in the trailer?

The image of the yellow emblazoned warrior in the TR2N trailer standing over his defeated opponent and showing no mercy has created a great deal debate in various places on the net with everyone voicing their opinion of what "Not anymore." means. Although many of the theories are intriguing I'm leaning towards the possibility that we are overlooking a very likely scenario by trying to impose our own will as fans onto what we hope the film will be.

The general consensus is that the program is CLU, or a perhaps a newer version of CLU that has been corrupted by the same virus that was the macguffin in the TRON 2.0 game. The yellow/green glow of his uniform and his viciousness seem to lend credence to this theory except that the virus would attempt to spread itself if given the chance, not destroy another program.

Another theory holds that since CLU had been absorbed by the MCP he retained part of the MCP's motives and would carry out orders that had been imprinted on him during his imprisonment. A rather large assumption is made here that the programs the MCP took over are released back into the system after it was destroyed, but if that was true then the climactic moment of TRON getting his disc into the center of the MCP just before Dumont is derezzed is pointless. It's far more likely that if the MCP was to absorb and derezz a program, that program would be lost forever.

Still others are stating that it's a reloaded version of CLU that FLYNN put back into the system after being released. This one makes little sense to me because Flynn wrote the CLU program to search for evidence of his creation of the video games Dillinger has based his fortune on. Therefore, the program is no longer needed as Flynn is now the owner of the company and would have no reason to reinsert the program to search for anymore hidden information.

All of these ideas are based on a premise that the movie sequel will follow after the storyline of the video game but with the lack of sales that the game had the film makers just might ignore its mythology and jump directly to a newly imagined reality.

So, at this point the prudent thing is to ask yourself one question. How many tank programs did Flynn write?

Many.

CLU was not Flynn's the first tank operator program and was only the last attempt he made before he was digitized into the system, and it would have been foolish of the MCP to have destroyed or absorbed all of the trained tank drivers he had captured. In the original movie, SARK offers the captured blue programs a chance to change sides and become defenders of the MCP. Many of the early versions of the CLU program may have crossed over. The fact that the drivers weren't very accurate in their shooting could have been a result of the less developed version of the operating software.

After the MCP was destroyed, were the traitors derezzed? Probably not. The system was now supposed to be free and all programs would most likely have been able to operate unhindered by for the most part, but Flynn would still be in charge of them. The CLU programs were written to be information seekers and in that function Flynn may have used them as a "police" force, or a version of an antiviral program. The resulting dictatorship could have left Flynn in power but as a user he would have just been a figurehead to where the real power would have been: with the CLU programs themselves. With no real power over the CLU programs, Flynn would only be able to stand idly by and watch the system he had risked his life to save fall apart.