I haven't seen this rumour anywhere else, but according to Viasat Motor(Swedish broadcaster) there's some talk around the Jerez press room that Marussia could make it to the grid, as a McLaren/Honda junior team.
They first reported it this morning, and now Janne Blomqvist(F1 commentator) says that he's heard more talk of something happening.
Inital report
Second
I'm not that good at reading Swedish, so I can't give you guys a full translation. Expect this to be bullshit, but I really want it to be true.
SUPER AGURI 2. BELIEVE.