It's hard to say. Looking at the vacancy snapshot (the final award should post sometime this evening, I'd guess), there are a lot of (>20) unfilled FO vacancies on:

In descending order:

-IAH 737
-EWR 737
-SFO 756
-SFO 320
-EWR 320

Note that the IAH 737 has about as many unfilled vacancies as the rest of the above combined, and the two 737 domiciles make up roughly 70% of the total vacancies.

The next group of unfilled vacancies (>10<20), in descending order:

-IAH 320
-DEN 320
-EWR 756

Going forward, I'd expect the majority of future vacancies to be in the top grouping, and predominantly 737 IAH. It's probable there will be a smattering of the rest listed in the top grouping on most bids, and perhaps occasionally a stray couple from the bottom grouping. There are less than 10 widebody FO vacancies unfilled at this point, and they're all SFO 787.