この先どうなるの。

this (something or someone close to the speaker (including the speaker), or ideas expressed by the speaker)

previous; prior; former; some time ago; preceding; point (e.g. pencil); tip; end; nozzle; head (of a line); front; ahead; the other side; the future; hereafter; destination; the other party

how; in what way; how about

to become; to get; to grow; to be; to reach; to attain; to result in; to prove to be; to consist of; to be composed of; to succeed; to be complete; to change into; to be exchanged for; to play a role; to be promoted; to do ...

indicates possessive; nominalizes verbs and adjectives; substitutes for "ga" in subordinate phrases; (at sentence-end, falling tone) indicates a confident conclusion; (at sentence-end) indicates emotional emphasis; (at sentence-end, rising tone) indicates question