When some journalists published information that Apple may deliberately slow down their devices people said that's impossible because nowadays every company on market wants to make the fastest available configuration. After some weeks unexpectedly Apple confirmed this rumor, and they said it was caused by problems with restarts of their phones and they wanted also to extend life of batteries. In the newest iOS update to 11.3 version it will change, because user will have option to choose if he wants to use full speed of phone, or he wants to use system in the more stable version.
Apart from this main change iOS 11.3 will add Business Chat in beta version, which will allow users to interact with some big companies like Discover, Hilton or Wells Fargo. We should also expect some new animojis like dragon, bear, skull and lion.