I find this quite annoying as I ordered one in September and have a delivery date of late May.... i was under the impression they were made to order so was happy to give my money and wait 8 months . Now you can pretty much get one in 6 weeks . Kind of sucks if I'm honest.
I responded on this topic
over on Massdrop at great length, but to briefly respond here for the benefit of others, these extra 300 are a separate shipment arriving after the first batch (as far as I am aware), so I don't think they'll ship at the same time. They may end up with a similar estimated ship date (late May), but that is a more of an indicator that previously ordered tents are ahead of schedule since they are in another shipment arriving first. I don't have detailed insight into where things are tracking with production and delivery, but Massdrop announced recently that tents are on schedule to start shipping on schedule in mid April for folks in the first drop (July) and previously they told me the rest of the tents from that drop wouldn't be far behind, so a late April/early May ship date for folks in the Sept/Dec drop looks likely.
Once these 300 are sold (which will take 2-7 days likely) then there won't be any more for a while. I think Massdrop has a small batch coming in the fall (e.g. 300 - 500) but otherwise nothing is in the works at present. The plan is to wait until these spring 2019 tents are delivered and folks have a few months to use them and comment, and then hopefully get the wheels turning in late summer on larger production run for spring 2020 which incorporates all the feedback.