Currently ~2 Billion.
There is a proposal to merge BTSX, AGS, and PTS together, which would create a new entity, named simply 'Bitshares'. For example, there might be 2.4 billion? 2.5 billion? Of the new Bitshares. While this seems like a dilution, the new bitshares would have more value than current BTSX does, because they would ALSO have the value of AGS/PTS of granting a stake in future DACs.
There is then a second proposal to allow for a capital infusion by issuing some more shares of Bitshares, to fund a marketing campaign. This would be decided by a vote of shareholders. If this vote passed, the number of shares could increase, but hopefully the money raised from this secondary offering would help enable a massive growth of Bitshares that would greatly increase the share value. (Those who believe the result would increase the value per share would vote yes, those who did not would vote no).