One of the objectives of 5G requires a massive use of frequency bands to allow both flexibility of use cases and large chunks of bandwidth allocated for very high throughput. Here is a summary of what frequency bands are considered so far for 5G.
I found some time ago a good PDF document from ZTE talking about APT 700 band for LTE and which was also showing a table of the theorical LTE coverage performance versus the radio frequency used. This is a very useful input to do quick coverage planning estimation based on the frequency band you can use.
More and more operators are announcing the shutdown of their 2G network, in a move to reallocate the spectrum for data services on 4G and better utilize the resource to deliver content to their subscribers. Telstra in Australia will be the next in line in December 2016, and many other operators are scheduled for 2017.