I count only 38 solar systems

That moment when you read something so incredibly stupid you don't even know how to respond...

There are no randomly generated planets anymore like ME1.

The side quests are now part of the main planets (think more KOTOR planets to land on lots of content but with the open world style of DAI)

There will be places we can land on (im guessing like stations and what not with side quests to) according to devs. Though the trial is literally just 3 minor systems to explore with a few things to find (some mineral deposits volcano, few satellites and 1 thing i wont mention due to spoilers) and 1 system that contains the first major planet EOS. 

I played for 10 hours and never quite made it to the cut off part but then im one of those players who stops and listens to every background conversation, explores every ? conversation option with every character. 

The side quests are long from what i've seen with lots of dialogue. Even the 3 most basic fetch quests (the only fetch quests i found) are more of a tutorial and have a good conversation explaining why. These are Scan planets, scan new types of minerals, and scan new alien species, but they are explained by the scientists giving them to you as furthering our understanding of the new galaxy.

I did not once encounter anything like that templar stole my ring kind of quest from DAI 

Id rather have 6 large worlds with intresting maps and quests around to explore, than 35 small worlds, which are completely barren and empty aside from some copypasted, boring warehouses, bases or mines, like we had in ME1.

True, even the main worlds were pretty much action corridors in ME1, aside from as small hub (a real small in Virmire, at salarian base). Only major hub was the Citadel.

On ME2, aside from your ship there was 4 main hubs, the rest of the worlds were action corridors, with one exception of Kasumis mission, which pretty much offered this little minihub as Hocks party. And explorable worlds? They were nothing, a couple of rooms and thats it.

ME3 was even worse, it pretty much took away all the exploration sidequests(except the 6 MP missions, which sucked) and replaced them with 50 "go to this planet and find this thing" fetch quests.

From what ive heard we have barely scratched the surface in the 10 hours we got to play the trial of MEA. And from what ive seen so far, exploration wise MEA wins over every game released so far in this series, but then again thats isnt so hard to accomplish considering the quality of this exploration weve gotten before.

Here what i think and hope were getting in this game:

6 large world maps with multiple sections, that open into smaller explorable areas as you explore them like caves or bases(which hopefully are handcrafted, not copypasted).

Some action corridors like in the original trilogy, weve seen couple so far, Peebes loyalty mission and Liams. Some of these open up via advancing story and relations, others by exploring. Exploring perhaps opens up smaller map like areas on other, secondary planets, or in other places on the main planets.

Then we have the Nexus, its pretty clear it opens up as we advance with the plot, and wake up colonists. It certainly adds the bar, the museum hall, maybe other places. I dotn know how many other hubs the game has, im pretty sure we will at least get the angara homeworld and Kadara's spaceport, plus the places weve seen on Elaaden.

To be fair they said 100 planets, not systems. And only a handful would be landable.

Looks like it's considerably more than the other ME games gave us. ME1 was padded with extra planets when a sidequest would have us go system hopping, like with Helena Blake and the gangsters in their dank hidey holes spanning 3 planets.