how many do we get of the final stock.

This what comsec say.

You will receive 0.749778075 of a Biota Pharmaceuticals Share for each Biota Share you hold on the Record Date.

This is reported on Yahoo http://finance.yahoo.com/q?s=NABI

NABI Biopharma establishes ratio for reverse stock split at one share for every six shares (NABI)

each ordinary share of Biota capital stock will be transferred to Nabi in exchange for 0.1249630125 of a share of Nabi common stock.

10000 x 0.749778075 = 7497
Nabi 1 for 6 = 6 x $1.78 = $10.68
7497 of Biota x 0.1249630125 = 936 shares
936 x $10.68 = $9996

So this must be wrong otherwise BTA would be trading in the 90cents.