Oracle has released a new MOS Note (Doc ID 2027072.1) which is describing the future of the Oracle Standard Edition.
Beginning with 18.104.22.168 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 22.214.171.124 SE2 is planned for Q3 of 2015.
Oracle will continue to provide full patching support for 126.96.36.199 for the current Editions 6 months post the release of SE2 188.8.131.52. Customers currently running Oracle Standard Edition will need to migrate their licenses to SE2 to be able to upgrade to 184.108.40.206.
Some notes currently pointing out that the upgrade path will be the same as when you upgrade to 220.127.116.11 (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.