I drove to the new segment today to inspect it. There is one passing lane section, approximately in the middle. The rest is two lanes (one each way) with a wide median on both sides. There are no intersecting roads, but I noticed two instances of property access from the road (and there may have been more).
The highway is not obviously designed for the addition of two more lanes in the future. I expected the two-lane facility to have a clear right-of-way on one side, for the addition of two more lanes. Examples are the Chisholm Trail Parkway in Tarrant county and SH 49 on the west side of Tyler. But there is no obvious provision for two more lanes. The right-of-way is wide enough for two more lanes, but it appears to be unexpectedly narrow in many places, which could preclude the addition of frontage roads. So it makes me wonder about the long term plan.
On a separate subject for SH 249, three of the four connection ramps at SH 249 and SH 99 are now open. Only the NB-WB ramp remains under construction, and it is nearing completion.