Difference between Before Long and Soon

BEFORE LONG vs SOON: ADJECTIVE

Immediately.
Before the usual or appointed time; early.
With willingness; readily.
Without hesitation; promptly or speedily.
Just prior to something; shortly.
In the near future; shortly.
In the near future
In a short time; shortly after any time specified or supposed.
Without the usual delay; before any time supposed; early.
Promptly; quickly; easily.
Readily; willingly; -- in this sense used with would, or some other word expressing will.
Immediately at or after another event.
As soon as; or, as soon as the time referred to arrives.
At some uncertain time in the future.
As soon as any; among the earliest; too soon.
Immediately, instantly
Within a short time; quickly
Early

Quickly; speedily; easily.
Readily; willingly; gladly: in this sense generally accompanied by would or some other word expressing will, and often in the comparative sooner, ‘rather.’
Synonyms and
Betimes, etc. (see early), promptly, quickly.
Lief.
Early; speedy; quick.
Early; before the time specified is much advanced: when the time, event, or the like has but just arrived: as, soon in the morning; soon at night (that is, early in the evening, or as soon as night sets in); soon at five o′ clock (that is, as soon as the hour of five arrives): an old locution still in use in the southern United States.
In a short time; at an early date or an early moment; before long; shortly; presently: as, winter will soon be here; I hope to see you soon.
Early; before the usual, proper, set, or expected time.
At once; forthwith; immediately.
(idiom) (sooner or later) At some time; eventually.
(idiom) (no sooner … than) As soon as.

In good time, At length, In haste, At one time, And then, Without delay, Just now, Oversoon, In due course, In no time, Eftsoons, In due time, Presently, Shortly, Soon

Later, Once, Before, Slowly, Promptly, Someday, Speedily, Immediately, Swiftly, Imminently, Sometime, Quickly, Before long, Presently, Shortly

In good time, At length, In haste, At one time, And then, Without delay, Just now, Oversoon, In due course, In no time, Eftsoons, In due time, Presently, Shortly, Soon

Forthwith, Pronto, Next, Later, Once, Before, Slowly, Someday, Immediately, Swiftly, Sometime, Quickly, Before long, Presently, Shortly

Might just delete this useless app before long.
They may stop before long unless trade improves.
Before long, his reputation as a patriot grew.
Before long we were playing every Friday night.
Before long, Bathasar and Teman fall in love.
Before long, a little before midnight, the ship was riding the waves beside a forest.
Given the split among the federal appeals courts, this dispute may end up before the Supreme Court before long.
Before long, Marcus found himself in the apartment of the Segal family, who had arrived from Romania just three months before.
And before long, Fargo took a long leap and launched himself from shore.
Even before Long spoke, Bost notified the officers that Long was her attacker.

You should receive your first job alert soon.
Europe soon, although I would absolutely love to.
Soon afterward photographers from Canada and Australia followed.
European Jews, who believe rescue will come soon.
But everything will be back to normal soon.
How soon may I begin to notarize documents?
You know the money is coming very soon.
Biopsy or autopsy tissue: Collect autopsy specimens as soon as possible and biopsy specimens as soon after onset of symptoms as possible.
The setup of the custom list and workflow required for this functionality will be posted soon as soon as someone requests it.
This CD was soon to become their lasting momento as the band split soon after, and were promptly then played by Radio One!