The above appraisal is from a recent edition of the U.S. version of Antiques Roadshow, and features a manuscript sonnet by Oscar Wilde which has recently come to light.
While it is a newly discovered manuscript, it is not a newly discovered poem. It is one from the Wilde canon which he retitled as Ideal Love and presented with a dedication to an acquaintance named Christian Gauss, a young American journalist.
The sin was mine; I did not understand.
So now is music prisoned in her cave,
Save where some ebbing desultory wave
Frets with its restless whirls this meagre strand.
And in the withered hollow of this land
Hath Summer dug herself so deep a grave,
That hardly can the silver willow crave
One little blossom from keen Winter’s hand.
But who is this who cometh by the shore?
(Nay, love, look up and wonder!) Who is this
Who cometh in dyed garments from the South?
It is thy new-found Lord, and he shall kiss
The yet unravished roses of thy mouth,
And I shall weep and worship, as before. 
A scholarly analysis of this discovery and the intriguing history of Wilde’s poem can be found in the current edition of the The Wildean, the journal the Oscar Wilde Society.
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