Well, I was forced to upgrade to Yosemite this week. I held out on Mt Lion as long as I could. Even shortly before the release of El Capitan there were signs of the impending demise of Mt Lion at work: certificate problems on some sites, installing Mt Lion from scratch (couldn’t) to try to fix a slow Mac, one critical package we use “deprecated” Mt Lion support in their current version.
I suspect Apple will stop providing security updates for Mt Lion, we’ll see in their next update. I haven’t decided yet if I will support Mt Lion if Apple does not continue security updates, it’s a nice solid system but the certificate issue makes it impractical for general use.
I was going to start looking at GDAL 2.0 this weekend, but I need to check that my development environment is working properly first. Shouldn’t be too hard.