[lambda]

The pattern is generally that Clang and GCC will have partial support when the standard is release, and full support a couple of years later. Intel will lag behind a year or two after that. Microsoft will be behind another year or two.

So, let's say that C++17 does come out in 2017. It will probably be the case that some of the features will be ready to use in GCC and Clang right away, and around 2019 or so they should have full or nearly full support. 2021 for Intel. 2023 for Microsoft.

So that gives you a range of answers. Depending on which features and which compiler, you could start using some of them immediately (or even before 2017, many of the features are implemented experimentally in advance), but if you want full support across the range of commonly used compilers, you're probably going to be waiting until the early to mid 2020s.