Oh HELL yes...
http://www.tvshowsondvd.com/news/Sunny-Philadelphia-A-Very-Sunny-Christmas/12410
In other IASIP news, they are actually doing the play "The Nightman Cometh" as a REAL play! It is coming to Seattle on the 22nd of September, tickets go on sale on Friday, August 7th.
http://www.livenation.com/artist/it-s-always-sunny-in-philadelphia-tickets/
EDIT: Apparently, they debuted this in LA last year, and are taking the show on the road.
http://www.tvshowsondvd.com/news/Sunny-Philadelphia-A-Very-Sunny-Christmas/12410
In other IASIP news, they are actually doing the play "The Nightman Cometh" as a REAL play! It is coming to Seattle on the 22nd of September, tickets go on sale on Friday, August 7th.
http://www.livenation.com/artist/it-s-always-sunny-in-philadelphia-tickets/
EDIT: Apparently, they debuted this in LA last year, and are taking the show on the road.