I was wonering that too. I just had a look at the RRS website and I see they have new P/N's listed for the MK-2 L-brackets so assuming the worst is probably appropriate. I suspect the area for accessing the connectors will change with the HDMI and microphone connections. It was pretty tight getting in there on the original version.
I see the old ones are going for around $100 on EBay though so you can get most of your money back. I also noticed a BH55 ballhead went for $483...they are $455 new on the RRS website. Go figure.
Steve.