I also posted this on the Wolfram Community site (link below)
Last week I attended the Wolfram Tour (which was great). I asked whenever we could expect a new version of Workbench, as the current (public) version 2 is very out dated. They responded that they use a more up to date version internally at Wolfram (with some sort of automatic update system) but this version has not been made public as it would require some effort to create a distributional version of it. The reason that they did not invest in this is probably that Workbench has not got many users, and therefor the effort to create a public version is too great in comparison to the number of users.
edit: The main reason for me to use Workbench is to create native Mathematica documentation. Also the breakpoints (and I do not lose my work if Mathematica crashes) are very usefull.
They advised us to create a public topic on this and ask for support of the community to make this a higher priority at Wolfram. Please let me (and wolfram) know that you are also interested in a new version of the Wolfram Workbench: http://community.wolfram.com/groups/-/m/t/870444
Edit: Apparently there is an up-to-date version of the eclipse plugin: http://support.wolfram.com/kb/27221.