Very little details at this point. Almost everything you will hear as of now is speculation.
We do know they are attempting to nuke all our airline JV and theatre JV protections and move to a single, highly "flexible" global balancing system. IMO they wouldn't even waste ink on that if their intended net effect was anything other than reducing our jobs further, even if only by a little.
Domestically they finally conceded that SEA is a hub and will be treated as one IAW our PWAs existing protections for a hub. Basically it should help protect us from any attempt to resurrect the ALK code share abuse that has, through completely different reasons, largely taken care of itself for now. Locking that in now when its cheap and easy would be nice IMO.
As for RJ's, again we don't have much specific to go on, but "word on the street" is they want more large RJ's (CRJ900/EMB175/etc) likely in exchange for an almost identical seat count in the form of less 50 seaters they don't like, don't want, they want to park anyway and likely can't staff going forward in the first place.
Small rumors of "even larger" RJ's but if true its likely that is merely a throwaway item to begin the time honored process of getting us to accept the premise and start negotiating with ourselves. Pretty sure that would be met with outright revolt if it wormed its way into any TA, especially at anywhere near these pathetic (and already concession laden) pay rates, so likely this is a non issue.