Is the Kett heading to the Milky Way Galaxy ( Earth) ?

Assuming the kett are even capable of making the trip, they'd get their ships raped by thanix cannons, or possibly even more potent weapons. In any scenario where galactic civilization was not totally eradicated, technology would have advanced nearly 1,200 years post reaper war, and this is putting aside that galactic civilization in total was more powerful than what we've seen f the kett before that. Fully established fleets would be up and running and there would be far too much ground to cover for the kett to meet any success. They might hit a small colony….might. Early warning detection might even stop them before they get to pop their milky way cherries. 

By the time Kett arrive MW natives would have crazy combat experience from defeating the Reaps. Kett are buncha betas compared to the former

Doubtful. Future dlc's and games, in this series, will more likely be in other clusters, of Adromada. There wouldn't be a reason to go back to the Milky Way, depending on what you chose to do at the end of ME3 (if you played the trilogy) there may not be any of the known races left. (If Shepard refused all option the catalyst gave or all high lvl organics were ascended to the reaper form) So even if the Kett went to the Milky Way, it wouldn't be the same as when the arks left.

If they sequel, they best beef up the Kett.

Right now they're the poor man's Prothean Empire.

Next game let us be the invaders and bring the fight to the Kett on their turf. Sort like what we di dto the Collects

Kett, meet the Yahgs .

Well if Shepard chose control, theyre in for a nasty surprise.

Yeah but that'd be like if the takeout I ordered bit my fingers off when I reached in the bag. 

i dont see why they would, they have only known that the milky way had life for a year and ahalf. getting there would take awhile, andif they were to invade, they would get wrecked.

Nah.

Or that dodgy kebab I had that took out a filling. Turn the Nexus on it's side, squint, giant shawarma machine. I like this idea, from the Kett perspective the whole Andromeda Initiative thing is just a really bad fast food experience.

It's possible and very likely that their empire doesn't span even a 10th of Andromeda, especially if they don't have relays to accelerate their spread.