See official NCAA rule change PROPOSAL document, attached.
Will the UIL accept these changes? All indications, so far, is yes, but, personally, I can't see them adopting the replay rule change, which would allow the use of replay without an RO. They'd have to have equipment on the sideline, and I just don't see the UIL wanting to "go there." I'd guess they'll continue to only allow replay in the Championship games. They may be OK with requiring coaches to toss a 'challenge flag' for challenges (during those games). Where will they get the flags? What will they look like? Hmm. Does each NFL team have a little red flag stationed on every sideline, for this purpose?

The other changes? Probably. In NCAA, especially, not stopping the clock for first downs inbounds is only logical, considering it was only stopping for one or two seconds in many cases (even though, by rule, it should not have re-started until the ball was ready-for-play). Obviously, despite lack of direction to do so, many TASO officials copied what the NCAA guys were doing. This will take a few minutes off the game clock, per game (2 mins - to 5 mins, I'd guess). Not a major crisis - just further erosion of playing time, stealing the time from the players, most of whom only get some 30-40 games to play in their entire lives.
No more freezing the kicker with two or three back-to-back time outs. No complaint here.
UIL already has a drone policy.
Halftime management - I can see the UIL taking exception to this, as in, no need for it, for UIL football. But, you never know. If the adopt it, this will be something more they'll want us to be responsible for, because they can't/won't be sportsmen, and take personal responsibility for.
All moot, until the PROP takes action, in late April. We'll see then, what the UIL does.