My money's on Tuesday, 370 - 375 new awards. I'm also betting the new awards in each area will be proportional to the number of existing 2009 awards for that area. (They distribute the number of awards a discipline gets based on the proportion of qualified applicants for that discipline relative to the total number of qualified applicants.)
If the extra ARRA funds need to be spent within the next 18 months (like most other ARRA funds), I could see this number doubling, or even tripling. I'm not holding my breath, though.