Board Thread:Spoilers!/@comment-4877635-20150304180627/@comment-3325613-20150430183517

Mmm... I actually think that IS Regina... The synopsis says "When  Gold's health takes a turn for the worse,  Isaac looks to a new ally for help procuring the magic ink he needs to re-write history" and the new ally is most likely Regina (she was talking to the author in the promo). So Regina is so determined to get her happy ending to resume (partially) her "evil" ways and get the ink for Isaac. Gold's probably going to be too ill during the episode to accomplish that himself...