Generally maintenance releases are scheduled on a quarterly basis.
This can be verified by checking the release dates of the MRs of NX 9.
NX 10.0.1 was released on February 27th, 2015, so the release of 10.0.2 should be around the end of May and start of June.
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I have heard that NX10.0.2 is tentatively around the 28th of July and NX10.01 MP3 around the 5th of June all things going well from what i have heard.
A bit off topic but...
Are there any new features in 10.0.2?
Yes, there are many CAM enhancents in 10.0.2.
In general, CAM enhancements are introduced in maintenance releases, so you can expect new features in 10.0.1, 10.0.2, and 10.0.3. Then these are all rolled up in to NX 11 for the main NX release.