Sorry, a BAF is a Build a Figure. Each character in the wave will come with a piece of Ronan The Accuser (Much like Hasbro's Mrvel Legends wave one all came with a piece of Annihilus)
This is Ronan
He's a Kree
The Spider-man BAF wave was leaked at the same time though they never said what the BAF would be. The Lineup was
Spider-man
Black Spiderman
Mary Jane
Sandman
Green Goblin
Hobgoblin
Doc Ock
Venom
Now due to these being mostly movie figures it was speculated this would be a movie line despite the fact that Jesse Falcon (Fomer head of the Marvel Legends line before the move to Hasbro and Consultant after) So Falcon did say that they were both comic based lines.
But Ash Talon over at the Fwoosh claims he has a source that confirmed these were movie based and the Hobgoblin was an error and it was meant to be New Goblin.
Should this be true it would mean that there is the 5 inch line that has the action fatures and the mutliple spideys, much like SM2 had. and later there will be the six in ch collectors line which will feature 2 spidesy (one in each costume) and they will be Super Articulated in the Marvel Legends style and not feature any Action Features.
The Build A Figure for this will Supposedly be the Giant Sandman (Or Muck Monster) as seen in the 7 minute preview.