Keep in mind that you're also going to gain a lot of space simply because updating the OS will purge the system caches. As you use the device, the caches will build back up, so a lot of the space gained will likely get taken back by the OS.
On my phone, I had about 7.3 GB of space available before updating. Immediately after updating, the space available increased to 7.9 GB. Now the space available has gone back down to 7.7 GB, with no new apps installed or other changes. Still about a 0.4 GB increase in available storage, but over time the OS might end up taking back more.
Also recall that upgrading from iOS 7.1.2 to iOS 8.0 took up between 740 MB and 1.03 GB, according to Arstechnica, which did fresh installations on identically prepped devices. This is a huge increase in the amount of space required by the OS, so there very well might have been a lot of cruft that could be deleted.
Keep in mind that you're also going to gain a lot of space simply because updating the OS will purge the system caches. As you use the device, the caches will build back up, so a lot of the space gained will likely get taken back by the OS.
On my phone, I had about 7.3 GB of space available before updating. Immediately after updating, the space available increased to 7.9 GB. Now the space available has gone back down to 7.7 GB, with no new apps installed or other changes. Still about a 0.4 GB increase in available storage, but over time the OS might end up taking back more.
Also recall that upgrading from iOS 7.1.2 to iOS 8.0 took up between 740 MB and 1.03 GB, according to Arstechnica, which did fresh installations on identically prepped devices. This is a huge increase in the amount of space required by the OS, so there very well might have been a lot of cruft that could be deleted.
Keep in mind that you're also going to gain a lot of space simply because updating the OS will purge the system caches. As you use the device, the caches will build back up, so a lot of the space gained will likely get taken back by the OS.
That's true, but I updated my phone within about 4 hours of the release, and I reported the gain as of today. I have opened and used at least 20 apps since then, so I don't think it's purely a cache issue for me.
I just checked again, and I have 51.7GB available.