Just got some early reports that the ending is different in a big way.
Instead of abstracting right away, Jax gets sick. Naturally sick, like a human would. The exact disease he's infected with isn't stated but it seems to either be some kind of sepsis, TB, or aids. Hard to tell when its a "virtual" disease or anything.
Pomni begs him to let Kinger try to help him, desperately convinced he can find another terminal to program on. But Jax refuses, citing his desire to not miss their bus ride to Miami. Jax tries to put on a jovial front despite his illness, but the mask slips when he urinates all over himself. He cries and mourns the pathetic state he's in, but Pomni is able to lift his spirits by making a joke about him taking an "unscheduled stop" before dressing him up in fancy new clothes.
Pomni tries to tell Jax she intends on getting a regular job instead of debasing herself as a jester, only to realize Jax is no longer moving or breathing. Pomni rushes to tell Bubble (who is driving the bus) and he asks her to close Jax's eyes, telling her that they'll be Miami soon. Pomni tearfully returns to Jax's body and wraps her arm around him one last time as she melancholically gazes out at the beautiful Florida beachside, heading towards an uncertain future with trauma and baggage, but also a new lease on life.