Fedora, like Ubuntu and many others probably don't bring the new Gnome desktop to the current version which uses the now "old" Gnome; in other words, the new version of the distribution will come with new version of Gnome, but it's not packaged for the old version. There are several reasons for this. One is that it's pretty big a work to package something as big as a desktop environment; another is that usually the new desktop environment depends on other newer software, so it would eventually lead to upgrading a lot of the old distributions' packages to those of the new distribution version; yet another reason is that most distributions start dropping their support for the old version after the new one comes out, and thus it's understandable that they are not willing to upgrade the desktop, because that would mean that they either would have to make updates for the old distribution longer or leave the old distribution version users with a potentially crap desktop (because bugs would be found but fixes not packaged and distributed anymore). In some cases the distribution maintainers do have updates available for a longer period of time; as an example of this are the Ubuntu LTS (Long Term Support) versions which get updates for a longer time than non-LTS versions (they release an LTS version, then non-LTS version(s), then LTS, ... so that those who don't want to upgrade/reinstall the system every 6 months can still use Ubuntu and get updates).
But if you don't want to upgrade your whole distribution and do want the new desktop, you can do so -- if you can't find binary packages (probably not, unless somebody has packaged them "home made"), you can always (try to) build the desktop from source. That requires you to have the build tools available, but you can get them easily using your package manager; then just compile the desktop and either package it as binary packages for your distribution and install them, or then install it directly after compilation. This requires some time and effort compared to just installing binary packages (or upgrading the whole distribution when the new version is released), and very probably leads to upgrading extra software too, and if you don't happen to find binary packages for those dependencies, you might have to compile them from source too prior to installing.
In short, wait for the new distribution release if the new Gnome is "a must" for you. That's the easiest route (others make the hard work, you just enjoy it).
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