I've had years and years and decades and generations of experience of playing Tremulous...also known as about 9 months.
I believe most of the "pro's" don't like the change because let's face it, now they need to adapt to a new kind of gameplay and basically completely change the way they play.
In 1.2 you'll need to learn (partially or completely)
New ways to aim(due to some hitboxes becoming smaller/larger, and vertical/horizontal slash areas are more/less.)
New ways to dodge, especially due to the new +button8 addition.
New ways to be a team (changes in weapons, such as md, might make md the new and powerful scrim tool for humans.)
New ways to use classes, meaning some aliens have become more powerful of a sort, and some have become weakened. (Mara is now easier to use, basi has less hp but regen ability.)
and many other things my inexperienced brain can't think of at the moment.
I think the pro's of 1.1 don't like the fact they might need to catch up to the noobs of 1.2.
My suggestion? You can host your own server and run 1.1, but i'm sure the population will die, and only 30 or so people will continue playing.
Or you can play the dev games right now, and when 1.2 is released, show us you're the true gamers of Tremulous and work your fucking ass off to become pros at THIS new style of gameplay.
Btw devs, you really need to work on making

porn.
