Re Arrow - apparently they're going to have Barry Allen turn up in at least three episodes as a back-door pilot for his own series. Not sure if this means there will be a super-fast Flash, they seem to be going out of their way to avoid having anyone with real super-powers in Arrow, but it'll be interesting to see what happens.
http://www.hollywoodreporter.com/live-feed/flash-writers-preview-cws-newest-595705
