Android 4.3 with Sense 5 is coming to HTC One today. LlabTooFeR, developer of Maximus HD ROM for HTC One tweeted that new version of Maximus HD ROM ( 12.0.0 ) based on Android 4.3 JellyBean and Sense 5 UI will be released today at 10:00 AM GMT ( 05:00 AM EST ).
This ROM might be based on Android 4.3 firmware which could be testing phase. There are no details on firmware number or change log yet. Wait for download link to come up and you may check Maximus HD ROM thread at XDA here for more updates.
Source : LlabTooFeR on Twitter
Update : Looks the firmware number is 3.09.401.1
Update 2 : ROM is now available for download. Here is the download link.