No. This will not be happening before spring or summer of next year at the earliest. They're keeping it as the last of the current three CBS shows (at the moment, the Charmed box is about to be finished) in order to have enough time to get additional bonus materials and hopefully get approval to recreate the original logo (which might or might not happen as CBS considers the one that was quickly put together for the old DVD covers and was seen on the season one BDs the new official one, so this will need some convincing...).
Anyway, no, there is no widescreen version. What was shown in the first teaser for the HD remaster was a cropped version of the full picture. That's not how the show was intended to be presented and wouldn't work since way too often faces and other things filling the full frame would be weirdly cut off.
For some shows, it's possible to open the frame and then have more image information on the sides, but for MacGyver, what you could see on the season 1 BD is already almost the full frame of the negative. It already had slightly more image information than the old tv master on all four sides.
To make clear what I'm talking about:
Here's an old comparison I did in 2018 between the old tv version of "Ghost Ship" and the fake "widescreen" version as seen in the first HD remaster teaser:

As you can see, there was about as much material added on the sides as was cut off at the top and bottom. With the typical 4:3 framing used in the 80s and 90s, this would just look odd when used for anything other than these few landscape shots. You'd have faces and other things that were supposed to be seen cut off at the top and bottom, while only non-essential new image areas would be added on the sides. (And I'm not even sure if the roughly 4:3 transfer of the season one BD didn't already show the full image of the film negative.)
For comparison, here's a scene from Gilmore Girls, which was originally framed with a smaller part of the film negative than MacGyver, which made it possible to open the sides for LOTS of new image information, while only a relatively small part is missing at the top and bottom (which is because most seasons were already filmed for a simultaneous 4:3 and HDTV airing):

Also for comparison, here's the old SD tv master put on top of the current BD master:

As you can see, as mentioned above, this has already quite a bit more image information on three sides (even though it's obviously a bit less than in that Ghost Ship "fake widescreen" sample).