The journal site has this sentence:
IMPORTANT NOTES, PLEASE READ
Primary Known Issues
■Lightroom 5 beta is not complete but please provide feedback on the available enhancements.
so it's not unreasonable to expect that there is more to come. My suggestions above are just speculation but they are based on various comments over the past year.
We currently have to round trip to CS6 for HDR but the raw pipeline and process 2012 was built with HDR in mind. If CS6 is just doing the layering and alignment it doesn't seem too much of a stretch to see it in this release. Stitching and Stacked focus have to be on the near horizon too. Excellent, I just noticed this: