I don't think a "Pi4B" is likely this year. I have my guesses as to what they might release!
I don't think USB 3.0 is likely either due to licensing cost.
The same for Gigabit Ethernet.
A Pi 3A+W
A Pi Zero 3/3W
Why did I say Pi 3A+W?
The Zero/ZeroW boards are nice. They are inexpensive to buy. They are not quite as inexpensive to operate. Because of the micro USB and mini HDMI connectors you have to have adapters or proper size cables for Zero setup to headless or headed operation. They are great project boards but just not perfect for the foundations mission. Their goal was for us to use readily available things like keyboards and mice to inexpensively learn to program on a raspberry pi. This is actually hampered somewhat on the Zero's unless you have a true Bluetooth keyboard/mouse hanging around, or Mini/Micro cables, hanging around. Most don't!
The A+ form factor at least has a full USB and HDMI. And it's smaller size is nice too. So no adapters and you can readily use the one USB to setup the board. If they go to the Pi 3 SoC they have to redesign the board anyway. So I think they will add the "W" when they do. The utility and convenience of onboard WiFi and Bluetooth is just too good. I also think they could do it for their second standard $25 price. I think this because 2B's and 3B's are essentially using the same SoC except for the clock rate. Plus again they can do away with the relatively expensive LAN9512 or LAN9514 chips and needed components. I think they will also go OTG if they do this.
Don't get me wrong, a 3Zero W, Zero3 W, 3W Zero,,,,, would return the foundation to it's normal release of a product that becomes readily UNavailable for the next 6 months to a year while stunting production of it's other established boards. LOL! But so would a Pi 3A+W, A3W+, A+3W,,,,,! Both are would be highly sought after boards! Ebay would again be full of 5X priced boards by speculators! And the Forums would again be full of posts about possible location here the boards are actually available at near foundation price! Yes a another typical foundation release!!!
Or maybe they will take this year off! Yes it would be disappointing but could happen. If they did take this year off it could bode well for a Pi 4B! But the foundation does enjoy it's releases, as well they should. I mean when you expected to make 10,000 or so boards but ended up making 14, 16, million and still counting, they do have something to be proud of, and enjoy.
We will know one way or the other or the other in 6 days!
Ha Ha got this slipped in before they locked the post. I didn't make it last time! It will get locked unfortunately, as some just begin complaining rather than discussing!
They have stated that Pi4 will most likely depart from the line of SoC's they have been using as a basis for the raspberry pi's. I do believe they have been surprised how readily Broadcom has been involved in the improvements (addition of processor cores, upgrades of technologies in the cores etc.) that have been made. And I think we should thank Broadcom for this work and their partnership with the Raspberry Pi Foundation. The main block for the USB is the VideoCore4. And it would have to be totally redesigned, from what I have read, to get past those problems. There has been big improvements in the USB from the original. We need to remember that the foundation is not out ot design or sell a mainstream computer system!
512MB version 2.0 as WordPress Server
Motorola Lapdock with Pi2B
Modded Rev 1.0 with pin headers at USB
(RS)Allied ships old stock to reward its Customers for long wait!