Hi there Micala!
I recommend sitting tight for now. The opening date for Be Our Guest Restaurant is not set in stone as of today, so it's hard to determine when in fact the doors may open. I would hold onto that Liberty Tree Tavern table until the day reservations for Be Our Guest actually open. This will give you lots of time to make a definite decision.
It is rumored that the the experience at BOG will be unlike traditional Quick Service dining. Guests will be seated in the dining room and will be served their delicious meals on real china as opposed to disposable tableware. You will order your meal from an interactive computer terminal and your food will be delivered to your table. No waiting at the counter and no plastic trays! The beauty of this amazing restaurant is reason enough to flock to the occasion and for dinner, the quick service establishment is transformed into an elegant table service experience.
If it were me, I'd definitely be excited about experiencing Be Our Guest, but Liberty Tree Tavern is great as well! Imagine comfort food served family-style amidst the backdrop of a historical colonial inn. The servers are dressed in colonial attire and the experience is really fun and authentic.
Keep your eyes and ears open for news and updates on the progress of Be Our Guest! My favorite source for Disney Parks news is the official
Disney Parks Blog!