Probably Samsung won't decide to present newest devices from Galaxy S series on MWC, but we know that firm makes two phones from that series - S8 and S8 Plus. Many decisions about specifications of those devices haven't been published yet, but Samsung recently made a decision regarding the capacity of the battery, which can be a unpleasant surprise for those who plan to purchase these devices.
After months of testing it was concluded that the ordinary version of the Galaxy S8 will appear on market with 3000mAh battery and better version, S8 Plus with 3500mAh battery (the same power had the battery used in Galaxy Note 7). The main argument confirming this decision was the fact that these phones will have processors manufactured in 10nm technology, so they will save more power. Time will tell whether it's good decision or a mistake like it was two years ago, when people complained about capacity of battery in Galaxy S6.