I think you may be thinking of the expansion of the Tier 4 pilot scheme, or perhaps a recent small change to the Tier 2 rules, but if so you have misunderstood them.
Under the Tier 4 pilot scheme students applying for a visa to study a one-year Masters at one of 23 UK universities in the 2018/19 academic year will be granted an extra 6 months at the end of their visa, not the normal extra 4 months. This will allow a little extra time for finding a job with which to transfer to Tier 2. See https://thepienews.com/news/uk-study-vi ... d-23-heis/
Separately, from yesterday someone switching from Tier 4 to Tier 2 does not need to wait until they have their results before their employer can issue the CoS. The employer can issue it as soon as the student has completed the course. However, some jobs may be conditional on achieving the qualification, so it would make no different in that case. See Immigration Rules, paragraph 245HD(d)(i). The Tier 2 and Tier 5 sponsor guidance issued this week does not appear to have been updated to reflect this.
People posting here are well-meaning, but they may also be unqualified and unregulated. I do not give immigration advice, just refer to Immigration Rules, guidance, other online content and to your sponsor to help you answer your question.