Fratelli Tutti
I have not read Pope Francis' latest encyclical letter but I intend to before the year is out. While many documents of varying authority come from the Vatican, encyclical letters in general are among the most authoritative. However, that being noted, there is still usually a diversity of statements of varying magisterial weight in an encyclical latter much as with any document issued either by the pope or in his name.
I went over the subject of the magisterium in detail earlier this year{1} both in scope{2} as well as the matter of proper interpretation thereof{3} so I see no need to reinvent that wheel. However, I do want to point out at least in passing that there will inevitably be no shortage of pundits, agenda provocateurs, and apologists who will treat this text as if each part of it is of equal weight.{4}
Too often documents issued by the Vatican are treated as a pretext by self-proclaimed More Moral Than Thou sorts for beating others over the head with parts that appear to support their preconceived presuppositions while ignoring or downplaying parts that appear to oppose said presuppositions thereof. Then there will be those who claim to be a faithful Catholic who will dismiss this encyclical wholesale lest they have to acknowledge something that is contrary to their particular worldview. Neither approach is correct for a faithful Catholic to take.
Having noted these things briefly, one final point: since most folks do not actually read Vatican documents except to prooftext them, be wary of those who seek to make too much or too little of the contents of the new encyclical letter. The truth on these matters is usually more nuanced than most folks either know or care to admit.
Notes:
{1} On the Magisterium of the Catholic Church, Obedience, and the Requirements of Faithful Catholics (circa February 26, 2020)
{2} See footnote one and also this thread:
On Clarifying and Retracting Some Prior Statements on the Magisterium (circa March 8, 2020)
{3} On Magisterial Interpretation (circa January 4, 2020)
{4} This is of course wrong but since when has that stopped those more interested in conflict than in genuine dialogue.