For those owning a due and those wanting to use Arduino IDE 1.5.2 beta for other reasons:
I have released beta V2 that supports Arduino IDE 1.5.2. beta.
Read more at http://blog.baeyens.it/#post4
If you do not need Arduino IDE 1.5.2 beta and you already use the plugin I advice to stick to the plugin version as described at Arduino Eclipse IDE named Sloeber - Welcome! untill Arduino IDE 1.5.X is no longer beta.
For people starting with the plugin V2 can be considered.
Best regards
Jantje