I hope you know that the IAVC is also staffed by non-fulltime forest service personal, some of whom have other "regular" jobs and are filling in. (Guess who answers the phone?) IOW, crampons for the south side of Forester?
If you really, really want to know the very latest, first-hand reports on JMT trail conditions, then simply follow the #pct hashtag on Instagram:
https://instagram.com/explore/tags/pct/https://instagram.com/explore/tags/pct2015/https://instagram.com/explore/tags/pacificcresttrail/You don't even need to find a direct shot of Forester/Whitney in the current page. Just follow someone who is north of Forester, since they will almost certainly have a shot of Forester/Whitney in their portfolio. For added information, a lot of time they will have a link to a blog where they describe summitting Whitney and/or crossing Forester. Can't get any better information than that.
If you're hiking in boots, then even spikes (if they fit) could be overkill. If you're wearing trail runners (which I do), and you feel like you must carry something - and at this point the snow is rapidly melting - then take spikes. Really, the one essential tool are your poles.
Edit: here's a few - note the time stamps:
https://instagram.com/p/3uwRL7R8Es/?tagged=pct2015https://instagram.com/p/3nCFvYGPAD/?taken-by=bobby_pct
