I'll probably be SR30+ by the time the beta is over and i'll post my thoughts as well. I'll try and keep it as organized as possible.
EDIT: Preface:: I only enjoy Halo 5 in its current form because of the AR/BR start. Former starting weapons in week one and week two were not enjoyable at all.
The one thing I'm worried the most about is the weapons getting nerfed. I've lurked Waypoint and I keep seeing people say nerf the AR, nerf the SMG, the game is too much BR and DMR...etc. That worries me. The single that that has plagued Halo since Halo 2 was weak starting weapons, intentional of course so that we were forced to pick up better weapons and easily pick off respawning players spawning with crap. The BR start was always the fallback because it provided the utility weapon gameplay that made Halo CE so good.
Even MLG's tournament settings were specifically trying to re-create Halo CE as much as possible...but the issue with the BR start was that the entire weapon sandbox was not designed behind a BR start, it was designed behind the default starting weapon.
Thus:
Halo 2 = SMG starts
Halo 3 = AR starts
Halo 4 = custom loadouts that basically negated ever pick up weapons on the map, plus shitty ordinance weapon drop concept...horrible design decision there.
Now we have Halo 5 with BR/AR start, and funny thing is, all the weapons on the map currently, outside of the pistol, are viable pickups. I'd take the SMG over the AR and I'd take the DMR over the BR. On top of that, the power weapons, sword, snipe and rockets (hyrda needs some tweaking in my opinion, I get the concept of lock-on when ADS, but I think it needs to be tweaked...not sure yet as to what), make the game feel a bit like Halo CE. I think once they add in the powerups, say, OS and camo on all the maps, yes, all the maps, I even think Truth should have powerups on it (look at Halo CE's wizard, a map smaller than Truth and it had OS and Camo), the game will be pretty solid overall.
Now we haven't even seen covey weapons or the shotgun. The light rifle is bad ass, and while every map shouldn't have every single weapon in the sandbox, I think this time around, Halo 5 has made a turn back to its roots from Halo CE, but it really comes down to the starting weapons being the AR/BR start by default across the board. If they change this, this will be worse than weapons being nerfed in my opinion.
Hopefully 343 just lays down the hammer and says, learn to use the weapons, learn to master the game that is Halo, learn to use the counters to the weapons, etc.
Whenever a new Street Fighter game comes out, people are so quick to say NERF NERF!!! Then after a couple of months of playing the game, it dawns upon them that the shit Capcom designed has counters to it...but knowing this comes from playing the game and discovering it.
Again, I'd be very careful to suggest nerfing anything in the game right now. I'd say, let the game launch come later this year, and if after a few months of playing the game, we'll know if weapons need obvious nerfs. Three weeks of playing an FPS and calling on weapons to be nerfed is just stupid. Three weeks is not enough time to make that determination.