JBPatch v4.0.0 released.
It supports all previously supported firmwares, plus the Paperwhite FW 5.3.4.
Note that the patches for FW 5.3.x now consist only of the hyphenation, margins, and dictionaries patch. The reasons are explained in some of my previous posts.
The font size patch has been dropped for 5.3.x Firmwares, as it seems to have caused way more problems than it solved (you can still install it manually on firmwares < 5.3.4, if you really want to).
For the 5.1.x firmwares, nothing has really changed.
For more information, see the details and upgrade notes in the first post.