This is a very quick recap of some major events which have happened within the last few months regarding NSX:
1) The first major licensing change for NSX was announced back in May 2016. If you are buying NSX today, you should read KB 2145269 . The typical customer that starts with micro-segmentation needs at least the Advanced tier, while customers upgrading from VCNS (which is no longer under support on September 19, 2016) can use the cheapest version of the product. This post by the register is a nice summary.
2) NSX 6.2.3 was recalled as it had problems (KB 2146227 and KB 2146293 are two examples) that caused downtime. 6.2.4 was released shortly after to correct this, and customers were advised to skip 6.2.3. This link is great to keep up to date with any NSX KBs and issues: http://blogs.vmware.com/kb/nsx
3) VCP-NV Exam news : the first version of the VCP-NV exam, VCPN610, was retired on November 30, 2015. The current version is called VCP6-NV and its code is 2V0-641. This is based on NSX v6.0. A new version of the exam, 2V0-642 which is based on NSX 6.2, is now in Beta (go to mylearn.vmware.com, head to the Pearson site using the new single sign on, and check under the Beta category). At a cost of only $50, it's worth taking, even if the timeline makes this more of a "practice run" than a serious study target.
4) The official study guide for the VCP6-NV 2V0-641 was officially released August 17. This book was written by Elver Sena Sosa, who I had the pleasure to meet in VMworld (more on that in another post). I bought my copy and had him sign it :)
Right now you can get it a discount using this post-VMworld promotion: http://www.pearsonitcertification.com/promotions/vmware-press-138356
If the promotion expires, you can also get it from my Amazon affiliate link below and you would automagically send me a very small cut of the sale price :)