I adored Ravenloft. I ran it all through the 90s and early 2000s (and ran it again using 2E in 2009-10). I was never able to really get as excited by the d20 Ravenloft material (ran it, and it just didn't have the same feel in play). The WOTC 3rd edition Expedition to Castle Ravenloft really didn't work for me (not did the S&S stuff). I bought the Curse of Strahd, and found that was just not for me. I know people who played it and love it. It just didn't feel like classic Ravenloft to me (to me classic Ravenloft is anything from the original module to the Domains of Dread). For me, the best core Ravenloft Material will always be Black Box, Van Richten Books and supplements like Feast of Goblyns and Castles Forlorn.
I have to say if they are going to do the Van Richten thing again, it is going to be really hard in my opinion for them to outdo the original van richten books. Those really enhanced play at the table for me in a way no other product ever has. I also think there were a lot of bad books done in that vein after the line left TSR (the books are sort of in first person, but the TSR books dealt with them in a more hammy, humorous, hammer horror type of way, that was a little over the top----and the later lines, IMO, got lost in the first person thing, took themselves too seriously and were little too goth). One feature of the Van Richten character they are probably going to have to jettison is his prejudice against the Vistani. This was a recurring trait, that was used as an ironic source of humor (it was meant as a flaw, and not a view the readers were meant to share). There is one line in one of the books where he talks about a Vistani who helped him on investigations and how he 'won't blame an individual for the failings of an entire race'. Van Richten was the butt of the joke (and it is clearly spinning off the common wisdom of not blaming a whole race of people for the failings of individuals). Those kinds of touches were important to the character and tone of the books. I don't think they will be able to do that in the current version (though I could be wrong).