We are currently using Sencha GXT 2.x
We want to know any news about 2.x discontinuation.
Is Sencha planning to relase new versions or they will just stop releasing more 2.x versions?
When the support for 2.x versions will expire?
As the link describes, it is available from the downloads page as well as from maven central. We're experiencing technical issues getting it listed on the support portal, but as it is available from multiple other sources, I don't expect that to be a big problem.
Support for GXT 2 will continue until GXT 4 is released - we currently do not have a date for GXT 4, so you can expect GXT 2 to continue for some time.