Some findings I got:
-Lord Sinistro's Sango is still online thanks to O Ilusionista
-Kong has sprites and sounds from the PSX game
-TheKOFGen made a custom screenpack based on Inuyasha
-Rurouni (formerly known as Dan Mt.) made intros (1.1 only)
All Juan Carlos stages were added already as one download, but thanks anyway
EDIT: Also added these findings:
-Aaron Alejandro's BBH
-FerchogtX's Felicia (offline)
-Whiplash's Jedah
-MH Styles' Morrigan (his MvC version and the edit of Beterhans's Awakened Morrigan)
-3D Morrigan by Dragon972
Added recent Mugen Guild releases:
-Ken by Burn(0)
-Chun-li by BurningSoul
-Charles_2011 edits (SFA Ken, Violent Ken)
-Emerie the G.O.A.T. edits (all offline)
-Violent Ken edit by BurningSoul & RagingRowen
-Foobs' CS patch for POTS Sakura
EDIT: Added some patches I found