(1) That Sony has discontinued the World's best pocket recorder. I have two but then again, I simply don't understand why a company would discontinue such a great little unit.
(2) Putting aside the corporate decision to discontinue it, not having a replacement for this market seems silly. Will I have to get a third unit? Jeez.
I very much suspect they discontinued the M10 because it was just a bit too good for something at that price, and it was disrupting Sony's sales and pricing model. If everybody was buying the M10 and attaching it to external mics, instead of shelling out the cash for Sony's premium models, Sony had to take action. Simply adding $200 to the RRP would have caused more hassle and negative publicity than anyone wanted, so the alternative was to discontinue and make sure the replacement wouldn't be useable in the same way.
Another possible theory is that Sony's Sales and Marketing department is staggeringly incompetent and didn't realise how many people used this unit. Considering how successful Sony is, I don't think that can be the case.