I got my L-plate yesterday. It's very nice, as usual. As a nice touch you can use the cable release in vertical position without any hassle with repositioning the L-plate. I absolutely love it.
The new Canon hand strap, on the other hand, is inferior to the old one and I regret selling the old one with the 1Ds3 because I was too lazy to remove it...
I pre-ordered the L-Plate without grip and it is still backordered. At least I haven't gotten mine yet. Will be interesting if it is the same or not and if it really is an issue.
I just got that e-mail as well but haven't had the chance to test mine as it is in the mail. Is it bad on the L-plate? if it's nice and tight I will have no problems keeping it.