The 16GB model is now $249, also $100 lower than previously listed.
There's no way of knowing if this signals a new "pure" Nexus smartphone is coming. The only 2013 phones that are close to that category are the HTC One and Samsung Galaxy S4 Google Play edition (GPe) phones, but those are still not pure Google.
The GPe devices are sans things such as TouchWiz and Sense, but still contain OEM kernels, and thus are not pure Google. In addition, those devices sell off-contract for the prices you'd expect, as opposed to the original $299 and $349 Nexus 4 prices, which were very good for an unsubsidized device.
However, the Nexus 4 is a year old, and is out-of-date. It doesn't even support LTE, but despite that, pricing this low for an off-contract phone might prove attractive to many.
Google said that price cuts will be made in Australia, Canada, France, Germany, Spain, Korea, as well as the U.S. and the U.K.; the price drop in those countries is at least 25 percent.