Same here. Got my E60 for the 21 Elmarit about a week after I ordered, but it's 3 months and counting I still don't have the E43. Fortunately I managed to find one, in Heliopan, and transferred the glass into a Leica E43 ring that the hood of my Summilux clips to.
The thing that pisses me off is B&H has them in-stock and so does Tony Rose. I brought that to Leica's attention in an e-mail but they just responded that I'll get one as soon as they're back in stock. Honestly I think they should've just included vouchers for 2 filters in the box with the M8 and let people redeem them at any Leica dealer.
POSTSCRIPT: Just received the E43 filter this morning (11/12/07)