From the SD page it seems to mean"Unlimited Basic".
"Sprint now offer Unlimited Plus plan with AutoPay at $120/mo. for 5 lines. You are require to BYOD or pay for full SRP phone to avail the offer. It seems there is no mention on the T&C for this promo to be change to a higher price once you have it, unlike the Unlimited Basic promo which the price will increase after 1/31/2020.
I have pretty good Sprint coverage. For the right person, the combination of high-cap hotspot, Mexico/Canada/International sounds attractive. I think it's a bargain, although it's way more plan than I need.
Convergence is happening between 3GPP (GSM) and 3GPP2 (CDMA), since 3GPP2 abandoned its own 4G standards in favor of 3GPP Long Term Evolution (LTE). Once CDMA is sunset, only 3GPP standards will remain. How quickly Sprint will sunset CDMA likely depends on when/if merger with T-Mobile is approved. I will be shocked if this process is not well underway within the next 5 years.