"With the aim of taking the defense power of the Turkish Armed Forces to the highest level thanks to the stage reached and the knowledge gained in the ALP-300G, and in line with the decision of the Defense Industry Executive Committee, the development of the
ALP-500G Fixed Early Warning Radar System, the largest member of the early warning radar family to date, has been initiated. Beyond being just a radar, the ALP-500G stands out as an integrated sensor solution
with its own building and a dome radome infrastructure, which will be designed and produced nationally for the first time. The ALP-500G will have a capability far beyond existing early warning radars in terms of detection range performance."
Aselsan 2023 official report calls 500G SEİRS. Page 115.
https://wwwcdn.aselsan.com/api/file/ASELSAN_2023_FAALIYET_RAPORU_20240530.pdf
Only image we have for it so far from Aselsan's instagram account. Interestingly calls it transportable via trucks and aircraft, but from what else is said about it, it will only be deployed on fixed locations:
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