One of the big questions about Google+ is “how does all this new stuff relate to all of Google’s old stuff?” In some cases, new features (like Google+ photo sharing) will be connected to existing ones (such as Picasa Web Albums). In others, I’m pretty positive, Google+ will replace weaker Google offerings (you can read Buzz within G+, which just makes it all the more clear that Buzz will be redundant if G+ catches on).
For now, things are a tad confusing. Over at ReadWriteWeb, Sarah Perez explains how Google+ interconnects with Picasa. The good news is that you can now get unlimited photo storage; the bad news is that there are catches and complications.