Google has always focused primarily on webapps.
Apple has always focused primarily on native apps.
After this announcement (and looking at Apple’s iCloud web control panel), I think it’s a reasonable assumption to expect the future of online services to encompass both native apps and web apps.
Still, it feels strange to me watching Google release a new service focused primarily around an app. Times are changing.
As for Google Keep itself, it looks a bit like Reminders coupled with a scrapbook. Looks a bit too disjointed for my taste, but I’m interested to see how it works.