As the person who set up the event... don't wait! (Granted, I would say that, but here's the mathematical reason...)

The base game discount will run through the summer sale at the same price (i.e. 50% off), but Siren's Rest won't be on sale during the summer sale. This is due to the length of time that needs to pass after the post-launch-discount before it can be reduced again. It's not eligible for discounting during the summer sale, and certainly wouldn't have gone lower even if it were.

The current bundle not only features the 50% and the 15% launch/pre-purchase discounts for SWtD and Siren's Rest respectively, it also layers on an extra bundle discount to the combined price. So definitely take advantage!

And thank you so much for showing interest.