This is speculation and a rumor, take nothing of it at heart. PWInsider broke the news first that Del Rio (or El Patron) was spotted in Orlando, but it could possibly be for reasons not related to BFG tonight. It could be he's headed to the event, but it's NOT confirmed by anyone in TNA, or by El Patron himself as of this post.
We've noted many promotions had an eye on Alberto once he left WWE. TNA was rumored to be one of those promotions, along with AAA(he's back there if I recall) and NJPW(not confirmed) and many more.