They are both on Fangoria's Chopping List, at any rate. MBD is listed as streeting Jan. 21, 2003, with a three-disc Dawn following on Apr. 22 of the same year.
Just to get rid of the goose egg next to your post(I hate it when it happens to me), I hope the Murder by Decree release will be well done. It was the 3rd movie I ever bought back in the late 70's(On Beta) & one of the first five Laserdiscs that I bought. Still have the LD, but the Beta tape is long gone.
I don't think this was news. I later found out these were on Anchor Bay's future release list. The dates were new, I think, but I guess they should be taken with a grain of salt.
I haven't actually seen Murder by Decree, but I like a lot of Bob Clark's work (Baby Dumbasses aside), and I'm a Sherlock Holmes fan.