Yeah, the 934mb is quite a bit higher than what you'd expect for a 165mph storm. Given that Felix is a very small storm, here's my theory as to what has happened: Able to quickly respond to changes in its environment, as Felix passed over the warm oceanic eddy south of Haiti, the surface heat drawn off of the surface rapidly increased. This helped to rapidly enhance the (secondary) circulation of the storm and increase the strength of its warm core aloft. As this happened, the (primary) circulation of the storm strengthened rapidly, resulting in a sharp increase in wind speed. Also given its small size, the pressure gradient component to describing the wind field is likely very large -- the 1 mb/1 nm Danny mentioned suggests this as well -- but the angular rotational component is also likely very large, moreso than normal.

Anyway, enough technical debate. While an eyewall cycle didn't look imminent on microwave imagery as of 8pm ET, Felix will shortly be leaving the warm eddy behind. Given that the minimum sea level pressure never really responded as much as one would expect, just leaving the eddy will likely see some reduction in the wind speeds. As an eyewall cycle occurs, perhaps starting tomorrow, the system will grow in size, likely bringing down the wind speeds further. I wouldn't be totally shocked to see a temporary weakening down to a category 4 storm again tomorrow. From there, depending on how close it comes to Honduras on its way to the Yucatan/Belize, it will have the opportunity to re-strengthen into a category 5 storm before landfall. We may had gone 15 years since the last landfalling cat. 5 storm with Dean, but we may not go much more than 2 weeks between them if Felix does the same.