Yes, official patch would be nice. My other opponent won't use betas...
I have absolutely no inside info, but michaelm is a coder, is or has been in contact with Matrix management, and I presume prefers officials over betas for himself, all things equal.
But, inferring, I think things aren't equal. Enough time has passed with dozens of betas to make me think that Matrix, which must pay the QA expense to go official, has told him that there will be one more, final, all-in official patch, and then AE is "done." Testing takes time and people and isn't free. Matrix has lots of newer games to put those assets against.
I'm not saying I wouldn't be fine with the r3 beta being the last. The game has come light-years from where it was when it shipped. But I wouldn't expect a series of official patches after this next one. I think he's trying to get all in that her can.
Just my opinion.