Welcome to Apple Discussions!
Apple doesn't typically announce this type of thing until it happens. If concerned about security, read my upgrade FAQ*:
http://www.macmaps.com/upgradefaq.html
No one here knows. Try not to ask questions about unannounced things as the
Terms of Use state in this passage the following restrictions on what may be posted:
"2. Submissions
Search or browse for existing answers before you ask a question. Someone else may have asked your question — it may save you some time.
Stay on topic. Apple's discussion forums are here to help people use Apple products and technologies more effectively. Unless otherwise noted, don't add Submissions about nontechnical topics, including:
That Apple rumor you saw on another website.
Discussions of Apple policies or procedures.
Speculations/rumors about unannounced products.
The status of your 1973 MG Midget restoration."
* Links to my pages may give me compensation.