I use pooled merged mining currently. Will the BFL ASIC's be able to also mine namecoins, or just the bitcoins? Maybe my gpu's can stick on merged mining, but mainly be there to get namecoins if those ASICs can't mine namecoins.
The "merged" part of merge mining is done in the "miner" (software). For the case of mining pools it is the pool server which generates the getworks (and constructions the block header to be compatible with both chains).
At the hardware level the hardware is simply hashing a number. It has no concept of what that number represents and thus there is no obstacle to merge mining.