There was no announcement at Google IO about KLP or 4.3. That would kinda suggest there's nothing imminent - or at least, not as imminent as June.
My own guess is that KLP will be announced along with the next new Nexus device - that may even mean the N5 announcement which is likely to be around October / November.
That would leave plenty of room for 4.3 to be released somewhere in between. I notice a few publications talking about something in July or August, but there doesn't appear to be any solid evidence for anything at this point.
According to some stories, the reason KLP wasn't announced at IO was because manufacturers wanted more time to roll out 4.2. Don't know if there's any truth in that - it sounds very like spin to me - but if there is, that might also suggest that Google has been under a lot of pressure to slow the release cycle right down.
Given how much grief manufacturers get about updating their devices, that could make sense.