Possibly shedding some light on an anticipated refresh, the 12.9-inch iPad Pro stock situation appears to be dwindling, with nearly no stock of popular models in high-volume stores, and an expected refresh date across the board of May 16.

Spot-checks of 20 Apple Retail stores show decreasing stock levels or no stock at all at retail, with the least expensive models, the 32-gigabyte with Wi-Fi and 128-gigabyte with LTE models, most profoundly impacted Apple Retail-wide. No guidance has been issued to stores as of yet on the declining stock levels.

One Apple Store staffer we spoke with said that it had "been a while" since they had any 12.9-inch iPad shipments at all, and they had been without the 32-gigabyte Wi-Fi only model for "a few weeks, now."

Additionally, the Apple online store is completely sold out of the 12.9-inch iPad Pro. Regardless of what model is chosen online, delivery time is listed as 2-3 weeks.

It is unclear if this is an anomaly related to overseas shipment of production, or an indication of a looming refresh. Similarly, in late February, all 12.9-inch iPad Pro models showed estimated ship dates of 2 to 3 weeks. Additionally, Apple's in-store pickup option was pushed back from February 20, exactly four weeks to Mar. 20.

The stock shortages from late February rectified themselves the first week of March, with everything suddenly made available both online, and in-store. However last time, the depleted stock on the 32GB model at our polled retail stores hadn't existed for as long as it has this time.