I was recently watching the Solo trailer and I noticed that there is a TIE fighter with an attachment (possibly extra blasters?) on the left-hand side of the pilot's cockpit:
Is this a new TIE fighter, or one that has been brought in from legends?
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Compensating for the relative fragility of the unshielded TIE starfighter is the armored TIE/rb, a reinforced heavy starfighter with much more powerful laser cannons.
There's some additional information to be found in the film's Official Guide. The 'TIE/rb heavy starfighter' is an upgraded version of the 'TIE/ln fighter', incorporating heavier armour and more firepower than is usually found on a line model fighter. The ship also includes an onboard droid intelligence and enhanced solar collectors.
I would guess it's some sort of precursor to the TIE Bomber. It looks very gunshippy, and we know the Empire (in both canon and legends) loves to evolve their various lines of ships, building on what came before. They were probably looking for a more bomber/gunship oriented starfighter, said 'hey the TIE design's good, let's modify/evolve that', and this is their first attempt before getting to the full elongated twin pod model we see in ESB.
I'm thinking that perhaps its the TIE Big gun, I know that the TIE big gun looks different in legends but if you notice it has larger cannons on the small pod, so maybe?
It's a TIE Seeker, they we're mostly deployed in the unknown regions to map new territories. However, seeing as their sensors were very advanced they can also function as pathfinders for other lesser TIE models to help navigate spacial hazards. In short, very expensive and rarely deployed except on critical missions.