Oracle has released a new MOS Note (Doc ID 2027072.1) which is describing the future of the Oracle Standard Edition.
Beginning with 12.1.0.2 the Standard Edition (SE) and the Standard Edition One (SEO) are replaced with the new Standard Edition 2 (SE2).
SE2 will run on Systems up to 2 Sockets, this is not different from the current SE1 rule but it will have the ability to support a two node RAC Cluster.
For me this means that a 4 socket SE installation will have to be migrated to EE or have to be reduced to match the socket policy.
The release of Oracle Database 12.1.0.2 SE2 is planned for Q3 of 2015.
Oracle will continue to provide full patching support for 12.1.0.1 for the current Editions 6 months post the release of SE2 12.1.0.2. Customers currently running Oracle Standard Edition will need to migrate their licenses to SE2 to be able to upgrade to 12.1.0.2.
Some notes currently pointing out that the upgrade path will be the same as when you upgrade to 12.1.0.2 (for example dbua or catctl.pl).
I speculate that the price of the new Standard Edition 2 will be between the Standard Edition (SE) and the Standard Edition One (SEO), but who knows it at the moment exactly. Maybe Oracle release a new License metric also.
Peter`s DBA Blog 
Hi Peter,
I cannot access that note, have you MOS „employee-level“ access? Or maybe my account has been downgraded :(?
Riccardo
Hello,
Oracle has drawn back this MOS Note at this time. If you like to read the Note try to Google the ID, there are many references on the Internet.
There is also a Long twitter message dialog between Oracle and the community to find.
regards
Peter
If I understand correctly, dropping SE1 basically means the entry price for an Oracle database has tripled. (17500 vs. 5800). A further bummer is the thread limitation of 16 per service (or 8 per RAC node), unless I have overseen that this cap was there before. I see the competitive context,i.e. vs MS SQL Server, but otherwise I am not sure what Oracle is heading at here. I would not be surprised if we will see a change sooner or later. I hope that Oracle will at least lift the partitioning burden for Hypervisors, but I am not seeing that so far.