There is a 'What's New' document with release details in the online help at:
SAP Adaptive Server Enterprise 16.0 SP01 – SAP Help Portal Page
For patch levels, when you are on the SWDC to download a patch click the 'Info' link beside the patch download:
Image may be NSFW.
Clik here to view.
This will open a list of SAPNotes for that SP with current PLs listed (one or more for that SP):
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Clik here to view.
Select the SAPNote you want:
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Clik here to view.
and you will be able to see and download all the traditional 'Sybase' EBF release info for all platforms.
HTH
Chris