In an increasingly active market with PSVR running away with the vast share of it (market numbers put psvr at 700k units vive 420k rift 220k in 2016) I guess oculus or their corporate paymasters wanted to increase their sales numbers a bit
So they've knocked 200 dollars off the price of the rift+touch bundle which takes it from 798 dollars to 598 more in the realm of the psvr's 500 dollar price tag. Of course you still need a fairly good pc to run the thing so psvr still has a lower tco even if you go for the ps4 pro to drive it.
Not sure if this is a desperate move or some sort of cut the price since we have vast facebook billions so can just run at a loss while everyone else goes out of business sort of move or a combination of reasons.
VR is niche market to the extreme but even in that niche the rift hasn't gained as much market share as the other players and with a load of people about to drop their own vr headsets competition on price is likely to become more fierce.
It's looking increasingly like valves "we provide a platform that anyone can use" with the opening up of their lighthouse modular tracker tech and steamvr being the smart long term play since they will benefit from any steamvr headset being released in sales through steam.
Not sure how people who've relatively recently shelled out the big bucks to get the rift and touch will feel. It seems like a similar move to the early xbox which had a large price slash after disappointing launch sales, in that instance they gave away a controller and games package to the early adopters to keep them sweet.