Update: Oculus revealed quite a lot at its pre-E3 event including a new Oculus Rift headset and controllers dubbed Oculus Touch. We weren't able to use the virtual reality headset or its controllers, because the company promised the E3 show floor is where all the VR action will take place.
By the time E3 rolls around players will be a year-and-a-half into the new console generation, so publishers, developers and platform creators need to bring their A-game to LA.
Here's what we'd like to see - and believe us when we tell you, this is simply a starting point for an ever-growing list.
Console craze ... and PCs now too!
We don't expect to see very much in the way of hardware at the 2015 expo. Both Sony and Microsoft will have gaming platforms in the market that are under two years old and if Nintendo's past form is anything to go by, it's doubtful it's ready to throw in the towel on the Wii U just yet.
But the notion of a slimmer, more svelte Xbox One wouldn't be unappreciated. On the other hand, if the PS4 loses any more weight it may disappear under your television altogether. What's more likely is that both Microsoft and Sony will make attempts to better utilise their mobile device gaming platforms. A price cut for any of the home consoles wouldn't be completely unexpected either.
An area of hardware we do expect to see plenty of is virtual reality. The Oculus Rift is officially expected to touch down next year, though pricing is still up in the air. But now that we know when to we'll see a more finalised version, we expect it to be at the LA expo with guns blazing.
Microsoft teased the HoloLens at Build 2015 developer conference, though we're sure all the juicy info will pop up in June. The HoloLens site even lists the following blurb: "Holographic computing promises whole new ways for us to create, collaborate, work, and play. We look forward to showing and telling you more at E3, the world's premier trade show for computer and video games and related products."
Sony's Project Morpheus still has some way to go, but Sony's made big leaps forward with the second generation of the headset, and we expect to see more games for it shown off at E3.
Finally, Valve used GDC 2015 to announce its new (and finalised) lineup of Steam Machines, which will launch later in the year. And if we're being incredibly optimistic for a moment? Half-Life 3, Portal 3 and Left 4 Dead 3 announced all at the same time. Imagine. Just imagine.
Speaking of imagining, year in and year out, our friends at PC Gamer would look on at the biggest gaming expo with wanting eyes. While Nintendo, Microsoft and Sony get to show off their wares with bombast, the excellent games and infinitely more powerful hardware on the PC received no such spotlight. But that's all about to change.
Presented by AMD and sponsored by Blizzard Entertainment, Bohemia Interactive, Tripwire Interactive and Digital Storm, PC Gamer will play host to the first E3 conference all about PC gaming.
In a surprise move, Phil Spencer will be a guest at the PC Gamer conference. Check out this interview with Spencer and PCG to find out more.
Hosted by StarCraft 2 e-sports commentator Sean 'Day' Plott, the PC Gaming Show will be live streamed in partnership with Twitch from the Belasco Theater in Los Angeles on June 16.
Joe Osborne also contributed to this article.