The first major impact of Walmart purchasing Jet and giving Jet more power over the Walmart website is happening now. Walmart is cancelling their Shipping Pass service (it was a $49 per year service that got you free shipping Prime-like), and will be refunding paying customers for the service. At the same time, they will lower the free shipping threshold from $50 to $35, and many items will be eligible for free 2-day shipping. Details at the Walmart help pages.
PS: Walmart has an open marketplace (like Amazon, NewEgg, Best Buy, Sears, etc), so the free shipping terms apply to items shipped by Walmart itself (not 3rd-party sellers). As usual with these type of offers, they cover the 48 contiguous states. Non-48 addresses and APO/FPO addresses with US zipcodes will get the free 3-5 day shipping. Until Star Trek Transporters (TM) become commercially available.