The Web Tools Platform's 3.5 release is now available, aligning with the Eclipse Kepler Simultaneous Release. For an overview of what's new in this release, check out the New and Noteworthy. WTP is featured in the Eclipse IDE for Java EE Developers and also contributes to many of the other Kepler packages. You can also download WTP builds manually or install just the features you want by working with the Kepler Update Site.
WTP 3.5 was officially released on June 26th, 2013.