It is confirmed from multiple sources that 320 GB Move Bundles are with FW 3.40 and no - it's not foolish. You can't take back all the stock made months prior release of the new FWs - that's how the distribution from manufacturer to local distrubutors and reselers simply works.
For example the Modnation Racers 250 GB Bundle is sold with FW 3.30 and so on. You'd hardly get at the moment any PS3 in stock with 3.42 not even mentioning 3.50. It's simply logisticly impossible to manage that in only aroud 3 or 4 weeks