Exactly its a New OS Build (8.10.14234.375), which was released last week.
In India all Lumia's which received Denim last week has got this OS build (14234) with Denim.
Except for 520,525,620,720 which got the update 3 weeks before. OS Version 14219
Almost all lumia's including 530,820,830,920,925,930,1020,1520 which got denim last week is updated with 8.10.14234.375 OS version.
625,630,1320 are yet to get denim in India. May be they will also get updated to this.
Nd 520,525,620,720 also may get this update in coming days.
It is unknown what is included in higher build 14234.
Meanwhile GDR2 (Update 2) is coming with OS Build 8.10.151116
PFD may be available Soon.