UPDATE: We received information from the Microsoft Store that the Halo: Reach PC Beta will not be available as a demo at Microsoft Stores. Here is their official word:
The information is based off of an inaccurate event listing which we are currently correcting and updating. Halo Reach PC Beta should not have been included, as there are no plans at this time to have the demo available in stores.
As part of Microsoft's E3 slate of fan events, select Microsoft stores will offer a chance to check out the Halo: Reach PC Closed Beta during E3. This comes after the planned April public testing window largely came and went. Near the end of April, Halo Community Manager Brian Jarrard posted that while the team at 343 was hard at work on porting Halo: The Master Chief Collection to PC, it was proving to be more difficult than originally imagined and that a new "target timeframe" wouldn't be coming.
With the appearance of the "E3 Fan Celebration 2019" event listing in certain Microsoft stores, it seems that 343 is ready to start testing Halo: Reach's PC port to a limited audience. Space at these events is limited to just 60 attendees, and you're required to RSVP in order to guarantee a slot. There's no publicly available list of these events, but you can check to see if your local Microsoft store is hosting one via the use of the general store directory. The E3 Fan Celebration event will also offer you a chance to watch the E3 showcase live, as well as a raffle and "compete in Gears of War afterwards." All of the events run on Sunday, June 9th, from 1pm-5pm.
The release of the Master Chief Collection on PC is easily one of the most highly-anticipated Halo events in years. It's then curious that the Halo: Reach PC Closed Beta would appear in such a limited number of Microsoft stores without much fanfare. As far as getting Halo fans to visit Microsoft stores is concerned, it would be a good way to drive store traffic and test the Closed Beta in a controlled environment. As E3 quickly approaches, Microsoft may well advertise the existence of the Halo: Reach PC Closed Beta before E3 kicks off proper. Considering that the entire Master Chief Collection is slated to release throughout the year, we'll likely hear more details about the planned release schedule at E3. Still, if you can't wait, you might find yourself able to check out the Halo: Reach PC port next month.