Most teams will shakedown their second Chassis here, if they already havnt done so at Jerez, McLaren, Ferarri, Renault and Mercedes i would asume have already done so, posibly Williams. That leaves Toro Rosso, Red Bull, Virgin, Lotus, Force India, BMW Sauber to shake down their second race going chassis. Id think that Lotus will probably not ideally shake down till Bahrain FP1.
It will probably not be on the cards, but there could be a Campos there on the last day, i think not, but its a 1500/1 rank outsider bet tho.
Most teams will probably debut many new parts, the diffuser for most will be left till Bahrain id recon.
Weather update:
http://weather.msn.com/local.aspx?wealo ... ona%2c+ESP
Looks like its gonna be fine tomorrow, friday looking like the best of the running. The weekend looks a little more vauge.