A lot of information came out of NikonRumors regarding the current status and future of the XQD format, which is so far only used by Nikon's high-end DSLRs since the D4. Lexar's XQD cards recently showed as discontinued on numerous online stores, leaving Sony to be the sole manufacturer of the fast (but expensive and sometimes unavailable) cards. Now, the future looks much brighter for XQD with Lexar announcing they will still distribute and fill stock of their own XQD cards and rumors of Hoodman's entry into the market. There's even news of developments with CFexpress, which will replace XQD in the future.
Lexar's temporary lapse in XQD production could possibly be explained by the fact that is was bought by the company that manufactured its flash storage products. There is apparently a set of Compact Flash, SD, and XQD cards ready to go, but with the wrong packaging. But a temporary license should remedy that in order to move the current product until new packaging for the new company can be created for future production batches.
In the meantime, it's been difficult (i.e. expensive) to get XQD cards, as flash storage prices have gone up due to a worldwide shortage. As we hope to pull out of the shortage and with Lexar's re-entry into the XQD market, it's very possible that XQD supply troubles are behind us. Hoodman is also rumored to start producing XQD cards in the near future.
Furthermore, Delkin already produces a CFexpress card, which is the next revision of the XQD card. As the format is based on PCIe, these new cards should be backward compatible with nothing more than a firmware update to current bodies, although there is still some confusion surrounding Delkin's confirmation that its CFexpress cards would not be backward compatible with any current body. From the confusing and contradictory statements from multiple parties, one might glean that CFexpress cards will be compatible with any XQD-card body and that XQD cards will be compatible with any CFexpress-card body. But it's certainly possible that either of the two will be the case, and manufacturers will almost certainly have to support these changes with proper firmware updates regardless.
Meanwhile, Rego also announced the development of its CFexpress cards. The new cards should provide theoretical transfer rates of up to 2 GB/s. Their compact size in comparison to full-sized SSDs makes them perfect for applications in compact cameras or drones, where every bit of size and weight reduction is of extreme importance.