Ds2 will be 14mo on Christmas day, also dc3. We've told ds1 and dd well in advance that Santa likes to recycle, so he will probably stop in the loft on his way down. Like you, we kept a fair bit of good stuff.
However, there are a few things that we will need to buy new i've realised, so off Santa he's having his own ride-on car / or maybe the thomas one (having invested heavily in wooden railways and engines over the last 8 yrs, that's an interest we're keen to encourage 
), dressing gown and the tomy hide and squeak eggs, as never had them before.
In his stocking, a little buggy book, Disney cd, thomas socks 
, and usual satsuma and maybe little biscuits. Have also got a lovely set of cards from M&S on a plastic ring, my first words type, which I'm hoping will go on the pram. Lovely bright colours / contrast on the photos.
I have gone through all the baby / toddler books and am getting rid of anything chewed / tatty or that was obviously cheap and naff to read (you know those books that never read well or made any sense and your heart would sink on the rare occasion you had to read them!) and am replacing with any classic board books we missed and a couple of decent lift the flap books. Have found a fab one for his birthday,, which he has absolutely loved, as the colours are so strong, and it has a similar one we'll get for Christmas. Can't link on phone but search sneak a peek colours, and sneak a peek words priddy on Amazon.
Also got him his own new bath book and little squirts toys set, so managed to find matching flannels (all hungry caterpillar), rather than the worn and faded third hand baby flannels we have.
From the loft, wooden toddle truck, wooden postbox shape sorter and a click clack caterpillar.
Ok, that's loads.....