I have little love for TOT at DCA. It's ugly and cheap looking and the ride experience isn't particularly great or interesting. It doesn't hold a candle to the one at DHS, and the TDS incarnation is superior to it as well. DCA and WDS got the short end of the TOT stick for sure.
The new attraction sounds fun and more repeatable. I hope they keep some of the creep factor involved, as TOT is DCA's only "spooky" attraction. The exterior looks elaborate and so does the interior concept art. This is about the best case scenario for a permanent overlay that I can envision. Rohde is great at his job, and he won't leave any stones unturned, even on an overlay. Very much looking forward to the other attractions that will be announced in the future.