Hi Attila,
I know that you addressed this question to people in SAP responsible for NetWeaver trial versions.
What I saw in SCN forums there are no plans for 7.4 trail on-premise version. See in this forum reply by Horst Keller on Feb 20, 2014:
http://scn.sap.com/community/abap/blog/2013/05/22/abap-news-for-release-740#comment-461345
@Horst: if this has changed meanwhile can you update us? Or can you point us to someone in SAP organization responsible for NetWeaver trial versions who could have more details on the topic?
thanks
m./