How do I manage double-faced cards in Innistrad (MTG) tournament play?
Yes, there's been a lot of anger about double-faced cards online.  Obviously they're going to "kind of, sort of" work, but only in a really clunky and annoying way.  No one want to have to be constantly subjecting their cards to wear and tear by sleeving and resleeving them - and players with bad memories are going to keep forgetting what's written on the second face too!

To answer your question, I cannot imagine there could be any possible objection to you keeping the number and nature of your DFCs secret.  I personally would probably want to invest in a deck box and keep the double-faced cards in there with your trades or casual decks.  Having any sort of visible "exchange-pile" (beyond your 15-card sideboard) when you sit down gives your opponent too much information: really, you don't want him knowing if you're playing double-faced cards at all, until you play one.

And if you think playing in Constructed tournaments is going to be annoying, just wait until you consider the implications for Draft.  Curse you, Wizards!  You've gone too far this time! :D