If I understand correctly we will have 16*6=96 demotion from Division III and only 64 play-off champion in Division IV. This means 32 extra promotions for those teams with the best standings.
Unfortunately my own team with 18-4 wins-losses won't make the cut so I'll have to win my play-off games tonight and the next few as well. However I was interested to see where the line was. Since 64 leagues is too much for manual work I tried pulling the data through the BB Api and I think I got it correct.
I'm sharing the ranking here in case your team is one of the teams up for automatic promotion or close to the line.
If your team is top 32 you are in. If your team is somewhere between 33 and 96 it will depend on whether teams below you (like mine) win their play-offs. For every team under place 96 that promotes there will be one team less in this top 96 that makes the promotion.
GlobalRank league teamName wins pf pa diff
32 IV.40 Utopia 75ers 21 2155 1253 902
33 IV.14 Giulianova Gioventù 21 2070 1171 899
34 IV.14 小一些 II 21 2288 1404 884
35 IV.15 Jerusalem Farmers 21 2262 1401 861
36 IV.18 Basket World Order 21 2347 1494 853
37 IV.6 Rekord Lubartów II 21 2442 1598 844
38 IV.17 Honey_Badgers 21 2381 1588 793
39 IV.53 Eutanazja 21 2430 1643 787
40 IV.64 Z Fighters 21 2253 1483 770
41 IV.23 C. B: Ferrol II 21 2658 1901 757
42 IV.61 Mile End Erks 21 2560 1804 756
43 IV.60 Lietuvos Patriotai II 21 2152 1397 755
44 IV.19 vadencourteam 21 2409 1662 747
45 IV.2 Recife Kobes 21 2332 1599 733
46 IV.51 MLK Dreamers 21 2438 1744 694
47 IV.50 Jurkunas 21 2553 1864 689
48 IV.10 我要踢足球 21 2081 1397 684
49 IV.62 Simuliacija II 21 2328 1652 676
50 IV.34 BC Sniegas II 21 2472 1814 658
51 IV.37 The Barri B.C. 21 2356 1711 645
52 IV.27 BC Paunch 21 2222 1579 643
53 IV.31 Gonçalinho Basket 21 2389 1801 588
54 IV.43 Duncan City Admirals 21 2625 2044 581
55 IV.21 OK Computer 21 2404 1844 560
56 IV.38 DallasTeam II 21 2391 1910 481
57 IV.46 #24 Black Mamba 21 2136 1663 473
58 IV.57 Dodgers Elite 20 2850 1751 1099
59 IV.12 Zanarkand Abes 20 2396 1489 907
60 IV.15 Team Infinity Jr. 20 2308 1485 823
61 IV.27 ShutUpnPlay 20 2458 1662 796
62 IV.45 塔塔 II 20 2329 1537 792
63 IV.50 High fly Development team 20 2489 1698 791
64 IV.30 Little Computer People 20 2543 1764 779
65 IV.53 Deportivo Cali Ut 20 2378 1602 776
66 IV.36 Lomita Lowriders 20 2619 1853 766
67 IV.3 AlphKnights 20 2344 1579 765
68 IV.20 uodl II 20 2332 1572 760
69 IV.27 Bc Teptukai 20 2243 1509 734
70 IV.56 Mojave Dust Devils 20 2641 1909 732
71 IV.15 Divi torņi 20 2498 1796 702
72 IV.50 C.A. Manya 20 2642 1954 688
73 IV.45 The Five Dollar Club 20 2423 1735 688
74 IV.55 CCT II 20 2534 1858 676
75 IV.43 Roukounes B.C. 20 2632 1958 674
76 IV.47 Oceans 7 20 2456 1783 673
77 IV.18 Brawlers 20 2384 1731 653
78 IV.1 Science City U21 20 2501 1854 647
79 IV.49 A.B.C. 20 2198 1560 638
80 IV.28 Monte Cristo Ghosts 20 2399 1763 636
81 IV.38 BC Snake Reunion 20 2811 2186 625
82 IV.23 Burton Blizzard 20 2708 2122 586
83 IV.51 Ground Zero 20 2322 1738 584
84 IV.56 Benalua CBB 20 2445 1869 576
85 IV.22 Colorado Rocky 20 2431 1881 550
86 IV.17 Gobliny II 20 2520 1987 533
87 IV.54 Chattanooga Locomotives 20 2465 1962 503
88 IV.29 .:Champions BC:. II 20 2254 1752 502
89 IV.54 Erewhon Ouroboros 20 2509 2016 493
90 IV.18 Nutcrushers 20 2148 1658 490
91 IV.35 planets and stars II 20 2312 1826 486
92 IV.4 Wall Breakers 20 2422 1939 483
93 IV.22 Dreamcatcher II 20 2198 1787 411
94 IV.2 Milano Calibro 9 19 2487 1580 907
95 IV.36 Palermitana Academy 19 2328 1566 762
96 IV.47 Lucky Hit 19 2476 1726 750
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97 IV.6 CA thibérien 19 2767 2026 741
98 IV.39 Black Wolfes 19 2120 1380 740
99 IV.23 Goldsborough II 19 2623 1894 729
100 IV.41 AlpenFlash Dunk Crew 19 2483 1763 720
I might need some edits to get the table formatting right.
Crunchy! If you eat fast enough