I don't know any details, but there is currently a stop sale on all new 718s due to something about a fuel tank bracket. My CGTS has now arrived at the dealership, but I can't take delivery yet 
MODERATOR NOTE
Below is the official notice for the recall from the NHTSA. This was added to the OP for convenience. Included below are links to associated documents at nhtsa.gov.
This is apparently a required recall and is not voluntary.
February 20, 2019 NHTSA Campaign Number: 19V113000
Fuel Leak After Crash
A fuel leak in the presence of an ignition source can increase the risk of fire.
NHTSA Campaign Number: 19V113000
Manufacturer: Porsche Cars North America, Inc.
Components: FUEL SYSTEM, GASOLINE, STRUCTURE
Potential Number of Units Affected: 14,388
Summary
Porsche Cars North America, Inc. (Porsche) is recalling certain 2017-2019 718 Boxster, 718 Boxster S, 718 Cayman and 718 Cayman S vehicles and 2018-2019 718 Boxster GTS and 2018-2019 718 Cayman GTS vehicles. In the event of a crash, a crossmember may detach from the luggage compartment bracket, possibly causing a fuel leak.
Remedy
Porsche will notify owners, and dealers will secure the crossmember with additional rivets, free of charge. The recall is expected to begin April 21, 2019. Owners may contact Porsche customer service at 1-800-767-7243. Porsche's number for this recall is AKA3.
Notes
Owners may also contact the National Highway Traffic Safety Administration Vehicle Safety Hotline at 1-888-327-4236 (TTY 1-800-424-9153), or go to www.safercar.gov.
3 Associated Documents
Recall Acknowledgement
Defect Notice 573 Report
Remedy Instructions and TSB
Porsche Recall Lookup/Search (using VIN)
MODERATOR NOTE
Below is the official notice for the recall from the NHTSA. This was added to the OP for convenience. Included below are links to associated documents at nhtsa.gov.
This is apparently a required recall and is not voluntary.
February 20, 2019 NHTSA Campaign Number: 19V113000
Fuel Leak After Crash
A fuel leak in the presence of an ignition source can increase the risk of fire.
NHTSA Campaign Number: 19V113000
Manufacturer: Porsche Cars North America, Inc.
Components: FUEL SYSTEM, GASOLINE, STRUCTURE
Potential Number of Units Affected: 14,388
Summary
Porsche Cars North America, Inc. (Porsche) is recalling certain 2017-2019 718 Boxster, 718 Boxster S, 718 Cayman and 718 Cayman S vehicles and 2018-2019 718 Boxster GTS and 2018-2019 718 Cayman GTS vehicles. In the event of a crash, a crossmember may detach from the luggage compartment bracket, possibly causing a fuel leak.
Remedy
Porsche will notify owners, and dealers will secure the crossmember with additional rivets, free of charge. The recall is expected to begin April 21, 2019. Owners may contact Porsche customer service at 1-800-767-7243. Porsche's number for this recall is AKA3.
Notes
Owners may also contact the National Highway Traffic Safety Administration Vehicle Safety Hotline at 1-888-327-4236 (TTY 1-800-424-9153), or go to www.safercar.gov.
3 Associated Documents
Recall Acknowledgement
Defect Notice 573 Report
Remedy Instructions and TSB
Porsche Recall Lookup/Search (using VIN)