First public-ready algorithms should be done around mid to late June.  However I am hesitant to 'release' the bitstreams unless numerous algorithms are available.  I wouldn't want someone to invest $10K in hardware with only 1 or 2 algorithms in case those coins profit or ROI suddenly changes.  A good investment would be to have 4-5 algorithms available, making the hardware more secure against market changes.
Anyway, once people start mining with PC's linked to numerous high end FPGA cards, they will be 'immune' to forks since the algorithms in the FPGA's can be changed as fast as developers can fork their coin, actually faster in most cases since even a poorly tested rig can still mine, whereas a coin cannot fork until the new setup is heavily tested.