For me, it's the oportunity to get some Jedi/Sith transmogging going on. I've always wanted to play SWToR, but I just don't want to give up WoW to buy something that probably won't last as long as Blizz has with WoW.
Seeing monk's gave me the perfect oportunity:
http://www.wowhead.com/item=34540 for Sith or http://www.wowhead.com/item=30908 for Jedi (for obvious reasons double sided, unless you can find a suitable polearm/staff that can look like a single bladed lightsaber).
Get some brown or white leather clean robes for the classic look, or maybe some uniform-looking battle gear for Jedi, or put on ye old http://www.wowhead.com/item=28414 (or <insert any hood/mask that looks like a Darth Vader inhaler>) and some black robes.
And the fact that Monk's, to me combat wise at least, are similar to Jedi and Sith gets me even more excited. Think about it, acrobatic, energy wielding, lightning shooting ( http://mop.wowhead.com/spell=117952 ) fighters.
Anyways, thats enough of me:
Why are YOU looking forward to monks? (And if you aren't, then why are you even strolling this forum?)