I'm sure everyone has already heard this from yesterday... but yes after believing there wouldn't be a new Raspberry Pi release for 2018 because nothing was announced at the end of Feb., the Raspberry Pi foundation pulled a fast one on Pi Day by announcing a new revision of the Raspberry Pi 3B. They added a + to the end of it: Raspberry Pi 3B+.
What's new? They improved power regulation and cooling of the CPU enabling a default clockrate 200MHz faster than the previous Pi (1.4GHz). They totally refreshed the radio components (with a nice RPi logo stamped on the cover of it) bumping the wifi to dual-band 802.11ac and Blutooth 4.2. They also improved ethernet performance making it "faster ethernet" but just under 1GBit along with 4 new pins for Power-over-Ethernet (PoE) capabilities with an add-on HAT. Overall it is a cleaner design and the best Raspberry Pi to date.
While some had hoped for a doubling of the RAM (still only 1GB) that just wasn't in the cards as RAM prices have been significantly increasing over the last year and it is very important to the Raspberry Pi Foundation to keep the price point at $35.
Quite a few reviewers got a hold of the new model early and were able to post informative videos on YouTube including some benchmarks. Retailers don't quite have them in stock yet but will RSN. I already put in my order with Newark and it should be shipping in about 10 days. I hope to get FedBerry going on mine for a desktop Fedora system. I'll post about that when the time comes. In the meantime, enjoy the following brief video mentioning what's new in the Raspberry Pi 3B+.